Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Additional Information (Detail)

v3.10.0.1
Long-Term Debt - Additional Information (Detail)
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 16, 2018
USD ($)
Apr. 24, 2018
Feb. 15, 2017
USD ($)
Mar. 09, 2016
USD ($)
May 04, 2015
Aug. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
$ / shares
Feb. 28, 2014
USD ($)
$ / shares
Sep. 30, 2018
USD ($)
$ / shares
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
$ / shares
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2014
USD ($)
Sep. 30, 2018
USD ($)
Day
d
$ / shares
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Mar. 09, 2011
USD ($)
Debt Instrument [Line Items]                                      
Outstanding principal amount                 $ 2,628,700,000             $ 2,628,700,000      
Loss on extinguishment of debt                               48,500,000      
Interest expense                 44,000,000     $ 43,000,000       137,700,000 $ 117,400,000    
Stock split conversion ratio   2           2                      
Paid-in-capital in excess of par value                 346,800,000             346,800,000   $ 407,300,000  
Long-term debt                 2,446,600,000             2,446,600,000   2,268,100,000  
Convertible notes paid                               582,500,000      
Letters of credit issued but undrawn                 38,800,000             38,800,000      
Capped call transactions [Member]                                      
Debt Instrument [Line Items]                                      
Capped call transactions with financial institutions               $ 123,800,000                      
Prepaid forward share repurchase transactions [Member]                                      
Debt Instrument [Line Items]                                      
Forward share repurchase transactions amount               685,800,000             $ 685,800,000        
Convertible Senior Notes Due 2019 [Member]                                      
Debt Instrument [Line Items]                                      
Outstanding principal amount               1,150,000,000 675,000,000             675,000,000   1,150,000,000  
Deferred financing costs                             26,600,000        
Aggregate principal amount of convertible senior notes issued               1,000,000,000                      
Interest expense                 10,500,000     17,200,000       37,900,000 50,900,000    
Non-cash interest expense                 6,500,000     10,400,000       23,300,000 30,600,000    
Amortization of deferred financing costs                 $ 700,000     1,000,000       $ 2,300,000 3,000,000    
Additional principal amount of convertible notes               $ 150,000,000                      
Convertible notes, interest rate               2.00% 2.00%             2.00%      
Convertible notes maturity               Aug. 15, 2019               Aug. 15, 2019      
Convertible notes, conversion feature                               Holders of the 2019 Convertible Notes may convert their notes at their option under the following circumstances: (i) during any calendar quarter commencing after the calendar quarter ending March 31, 2014, if the last reported sale price of the Company’s common shares for at least 20 trading days (whether or not consecutive) in a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter exceeds 130% of the conversion price for the 2019 Convertible Notes on each applicable trading day; (ii) during the five business-day period immediately after any five consecutive trading day period, or the measurement period, in which the trading price per $1,000 principal amount of 2019 Convertible Notes for each trading day of that measurement period was less than 98% of the product of the last reported sale price of the Company’s common shares and the conversion rate for the 2019 Convertible Notes for each such day; or (iii) upon the occurrence of specified corporate events. On and after May 15, 2019, holders may convert their 2019 Convertible Notes at any time, regardless of the foregoing circumstances.      
Convertible notes, number of trading days of threshold limit (whether or not consecutive) | Day                               20      
Convertible notes, number of trading days of threshold limit in consecutive days | Day                               30      
Minimum percentage of common share price over conversion price for conversion               130.00%                      
Principal amount of convertible notes               $ 1,000               $ 1,000      
Minimum percentage of the product of common share price and conversion rate for convertible notes               98.00%                      
Convertible notes conversion rate               23.1816               23.2245      
Convertible notes conversion price | $ / shares               $ 43.14 $ 43.06             $ 43.06      
Stock split conversion ratio   2                                  
Paid-in-capital in excess of par value               $ 219,100,000             5,100,000        
Long-term debt               $ 930,900,000                      
Effective interest rate on convertible notes               6.20%                      
Convertible notes paid             $ 583,500,000                        
Accrued interest             1,000,000       $ 1,000,000                
Fair value of liability to convertible notes                 $ 660,500,000             $ 660,500,000   1,066,000,000  
Unamortized debt discount and debt issuance costs                 25,900,000             25,900,000   80,000,000  
Convertible senior notes, carrying value of liability component                 649,100,000             649,100,000   $ 1,070,000,000  
Convertible Senior Notes Due 2019 [Member] | Repurchase of 2019 Convertible Notes [Member]                                      
Debt Instrument [Line Items]                                      
Loss on extinguishment of debt             13,100,000                 13,100,000      
Repurchase of convertible notes             475,000,000                 475,000,000      
Fair value of liability to convertible notes             459,400,000       459,400,000                
Fair value of equity component to convertible notes             123,000,000       123,000,000                
Reduction to long-term debt representing liability component of convertible notes             446,400,000                        
Reduction to additional paid-in capital representing equity component             123,000,000                        
Convertible Senior Notes Due 2019 [Member] | Debt Issuance Costs [Member]                                      
Debt Instrument [Line Items]                                      
Deferred financing costs                             $ 21,500,000        
Convertible Senior Notes Due 2024 [Member]                                      
Debt Instrument [Line Items]                                      
Outstanding principal amount                 550,000,000             550,000,000      
Deferred financing costs             12,900,000       12,900,000                
Aggregate principal amount of convertible senior notes issued             $ 550,000,000       $ 550,000,000                
Interest expense                 8,600,000             17,900,000      
Non-cash interest expense                 4,700,000             9,700,000      
Amortization of deferred financing costs                 $ 400,000             $ 700,000      
Convertible notes, interest rate             2.625%   2.625%   2.625%         2.625%      
Convertible notes maturity             Mar. 15, 2024                 Mar. 15, 2024      
Convertible notes, conversion feature                               Holders of the 2024 Convertible Notes may convert their notes at their option under the following circumstances: (i) during any calendar quarter commencing after the calendar quarter ending June 30, 2018, if the last reported sale price of the Company’s common shares for at least 20 trading days (whether or not consecutive) in a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter exceeds 130% of the conversion price for the 2024 Convertible Notes on each applicable trading day; (ii) during the five business-day period immediately after any five consecutive trading day period, or the measurement period, in which the trading price per $1,000 principal amount of 2024 Convertible Notes for each trading day of that measurement period was less than 98% of the product of the last reported sale price of the Company’s common shares and the conversion rate for the 2024 Convertible Notes for each such day; (iii) if the Company calls the 2024 Convertible Notes for redemption; or (iv) upon the occurrence of specified corporate events. On and after December 15, 2023, holders may convert their 2024 Convertible Notes at any time, regardless of the foregoing circumstances.      
Convertible notes, number of trading days of threshold limit (whether or not consecutive) | d                               20      
Convertible notes, number of trading days of threshold limit in consecutive days | d                               30      
Minimum percentage of common share price over conversion price for conversion             130.00%                        
Principal amount of convertible notes             $ 1,000                 $ 1,000      
Minimum percentage of the product of common share price and conversion rate for convertible notes             98.00%                        
Convertible notes conversion rate             16.0056                 16.0352      
Convertible notes conversion price | $ / shares             $ 62.48   $ 62.36   $ 62.48         $ 62.36      
Stock split conversion ratio   2                                  
Paid-in-capital in excess of par value             $ 139,900,000       $ 139,900,000                
Long-term debt             $ 410,100,000       $ 410,100,000                
Effective interest rate on convertible notes             8.40%       8.40%                
Fair value of liability to convertible notes                 $ 455,800,000             $ 455,800,000      
Unamortized debt discount and debt issuance costs                 139,100,000             139,100,000      
Convertible senior notes, carrying value of liability component                 410,900,000             410,900,000      
Deferred financing costs recorded as additional paid-in-capital in excess of par value             $ 3,300,000       $ 3,300,000                
Convertible Senior Notes Due 2024 [Member] | Debt Issuance Costs [Member]                                      
Debt Instrument [Line Items]                                      
Deferred financing costs             $ 9,600,000       9,600,000                
Senior Notes Due 2026 [Member]                                      
Debt Instrument [Line Items]                                      
Outstanding principal amount                 400,000,000             400,000,000      
Deferred financing costs                 $ 5,400,000             5,400,000      
Aggregate principal amount of convertible senior notes issued           $ 400,000,000                          
Interest expense                               3,700,000      
Amortization of deferred financing costs                               $ 100,000      
Convertible notes, interest rate           7.25%     7.25%             7.25%      
Convertible notes maturity           Aug. 15, 2026                   Aug. 15, 2026      
Senior notes, redemption price, percentage           100.00%                          
Senior notes, redemption price percentage with equity offerings           107.25%                          
Carrying amount                 $ 394,600,000             $ 394,600,000      
Fair value of notes                 407,800,000             407,800,000      
Senior Notes Due 2026 [Member] | Debt Issuance Costs [Member]                                      
Debt Instrument [Line Items]                                      
Deferred financing costs                 5,400,000             $ 5,400,000      
Maximum [Member] | Senior Notes Due 2026 [Member]                                      
Debt Instrument [Line Items]                                      
Percentage of aggregate pricipal amount of senior notes being redeemed           40.00%                          
2011 Credit Facility [Member]                                      
Debt Instrument [Line Items]                                      
Credit facility, amount repaid                           $ 410,000,000          
2011 Credit Facility [Member] | 2011 Term Loan [Member]                                      
Debt Instrument [Line Items]                                      
Credit facility, maximum amount                                     $ 500,000,000
Credit facility amendment date                               Jul. 26, 2012      
Credit facility, maturity date                               Mar. 09, 2016      
Repayment of prior senior secured credit facility       $ 229,700,000                              
2011 Credit Facility [Member] | 2011 Term Loan [Member] | LIBOR [Member] | Minimum [Member]                                      
Debt Instrument [Line Items]                                      
Interest rate spread on variable rate         2.00%                            
2011 Credit Facility [Member] | 2011 Term Loan [Member] | LIBOR [Member] | Maximum [Member]                                      
Debt Instrument [Line Items]                                      
Interest rate spread on variable rate         3.00%                            
2011 Credit Facility [Member] | 2011 Term Loan [Member] | Base Rate [Member] | Minimum [Member]                                      
Debt Instrument [Line Items]                                      
Interest rate spread on variable rate         1.00%                            
2011 Credit Facility [Member] | 2011 Term Loan [Member] | Base Rate [Member] | Maximum [Member]                                      
Debt Instrument [Line Items]                                      
Interest rate spread on variable rate         2.00%                            
2011 Credit Facility [Member] | 2011 Revolving Credit Facility [Member]                                      
Debt Instrument [Line Items]                                      
Credit facility, maximum amount                                     $ 700,000,000
Credit facility amendment date                               May 04, 2015      
Line of credit facility extended maturity period                               1 year      
Amended maturity date of credit facility                               Mar. 09, 2017      
Repayment of prior senior secured credit facility     $ 410,000,000                                
Revolving credit facility termination date                               Feb. 15, 2017      
2011 Credit Facility [Member] | 2011 Revolving Credit Facility [Member] | LIBOR [Member] | Minimum [Member]                                      
Debt Instrument [Line Items]                                      
Interest rate spread on variable rate         4.00%                            
2011 Credit Facility [Member] | 2011 Revolving Credit Facility [Member] | LIBOR [Member] | Maximum [Member]                                      
Debt Instrument [Line Items]                                      
Interest rate spread on variable rate         5.00%                            
2011 Credit Facility [Member] | 2011 Revolving Credit Facility [Member] | Base Rate [Member] | Minimum [Member]                                      
Debt Instrument [Line Items]                                      
Interest rate spread on variable rate         3.00%                            
2011 Credit Facility [Member] | 2011 Revolving Credit Facility [Member] | Base Rate [Member] | Maximum [Member]                                      
Debt Instrument [Line Items]                                      
Interest rate spread on variable rate         4.00%                            
2017 Credit Facility [Member]                                      
Debt Instrument [Line Items]                                      
Credit facility, maximum amount     1,450,000,000                                
Credit Facility amended, effective date                               Mar. 16, 2018      
Deferred financing costs     $ 22,600,000                                
Credit facility, amount repaid $ 1,178,100,000               1,178,100,000 $ 24,400,000 $ 24,400,000 24,400,000 $ 24,400,000            
Long-term debt, weighted average interest rate                                   6.79%  
Borrowings under the senior secured credit facility                                   $ 1,226,900,000  
Foreign currency borrowings, outstanding                                   0  
Interest expense                       24,400,000         59,600,000    
Non-cash interest expense                       1,200,000         3,000,000    
Amortization of deferred financing costs                       $ 1,000,000         $ 2,600,000    
2017 Credit Facility [Member] | Other Expense [Member]                                      
Debt Instrument [Line Items]                                      
Loss on extinguishment of debt                 $ 35,400,000             $ 35,400,000      
2017 Credit Facility [Member] | LIBOR [Member]                                      
Debt Instrument [Line Items]                                      
Interest rate spread on variable rate     1.00%                                
2017 Credit Facility [Member] | Base Rate [Member]                                      
Debt Instrument [Line Items]                                      
Base rate interest rate floor     1.75%                                
2017 Credit Facility [Member] | Federal Funds Rate [Member]                                      
Debt Instrument [Line Items]                                      
Interest rate spread on variable rate     0.50%                                
2017 Credit Facility [Member] | 2017 Term Loan B [Member]                                      
Debt Instrument [Line Items]                                      
Credit facility, maturity date                               Feb. 15, 2023      
Outstanding principal amount     $ 1,300,000,000                                
Senior secured credit facility, discount percentage     2.00%                                
Senior secured credit facility, discount amount     $ 26,000,000                                
Borrowings under the senior secured credit facility                                   1,226,900,000  
2017 Credit Facility [Member] | 2017 Term Loan B [Member] | Level 2 [Member]                                      
Debt Instrument [Line Items]                                      
Outstanding principal amount                                   1,190,200,000  
Debt instrument, fair value                                   1,226,100,000  
2017 Credit Facility [Member] | 2017 Term Loan B [Member] | Base Rate [Member]                                      
Debt Instrument [Line Items]                                      
Interest rate spread on variable rate     4.50%                                
2017 Credit Facility [Member] | 2017 Term Loan B [Member] | Eurodollar [Member]                                      
Debt Instrument [Line Items]                                      
Interest rate spread on variable rate     5.50%                                
2017 Credit Facility [Member] | 2017 Revolving Credit Facility [Member]                                      
Debt Instrument [Line Items]                                      
Credit facility, maximum amount     $ 150,000,000                                
Credit facility, maturity date                               Feb. 15, 2022      
Repayment of prior senior secured credit facility 1,178,100,000                                    
Credit facility LIBOR minimum floor rate interest     0.75%                                
Borrowings under the senior secured credit facility                                   $ 0  
2017 Credit Facility [Member] | 2017 Revolving Credit Facility [Member] | Base Rate [Member] | Scenario Leverage Ratio One [Member]                                      
Debt Instrument [Line Items]                                      
Interest rate spread on variable rate     3.50%                                
2017 Credit Facility [Member] | 2017 Revolving Credit Facility [Member] | Base Rate [Member] | Scenario Leverage Ratio Two [Member]                                      
Debt Instrument [Line Items]                                      
Interest rate spread on variable rate     3.75%                                
2017 Credit Facility [Member] | 2017 Revolving Credit Facility [Member] | Eurodollar [Member] | Scenario Leverage Ratio One [Member]                                      
Debt Instrument [Line Items]                                      
Interest rate spread on variable rate     4.50%                                
2017 Credit Facility [Member] | 2017 Revolving Credit Facility [Member] | Eurodollar [Member] | Scenario Leverage Ratio Two [Member]                                      
Debt Instrument [Line Items]                                      
Interest rate spread on variable rate     4.75%                                
2017 Credit Facility [Member] | 2017 Revolving Credit Facility [Member] | 2017 Term Loan B [Member]                                      
Debt Instrument [Line Items]                                      
Revolving credit facility termination date                               Aug. 16, 2018      
2018 Credit Facility [Member]                                      
Debt Instrument [Line Items]                                      
Credit facility, maximum amount 1,250,000,000                                    
Deferred financing costs 11,700,000                                    
Line of credit facility, frequency of interest payments                               quarterly      
Long-term debt, weighted average interest rate                 7.14%             7.14%      
Borrowings under the senior secured credit facility                 $ 1,000,000,000             $ 1,000,000,000      
Foreign currency borrowings, outstanding                 0             0      
Interest expense                 19,600,000             68,700,000      
Non-cash interest expense                 600,000             2,900,000      
Amortization of deferred financing costs                 700,000             $ 2,800,000      
2018 Credit Facility [Member] | Minimum [Member] | 2019 Convertible Notes Exceeds 350 Million [Member]                                      
Debt Instrument [Line Items]                                      
Outstanding principal amount 350,000,000                                    
2018 Credit Facility [Member] | Minimum [Member] | 2024 Convertible Notes Exceeds 350 Million [Member]                                      
Debt Instrument [Line Items]                                      
Outstanding principal amount $ 350,000,000                                    
2018 Credit Facility [Member] | LIBOR [Member]                                      
Debt Instrument [Line Items]                                      
Interest rate spread on variable rate 1.00%                                    
2018 Credit Facility [Member] | Base Rate [Member]                                      
Debt Instrument [Line Items]                                      
Base rate interest rate floor 1.00%                                    
2018 Credit Facility [Member] | Federal Funds Rate [Member]                                      
Debt Instrument [Line Items]                                      
Interest rate spread on variable rate 0.50%                                    
2018 Credit Facility [Member] | 2018 Term Loan A [Member]                                      
Debt Instrument [Line Items]                                      
Credit facility, maturity date Aug. 16, 2023                                    
Outstanding principal amount $ 250,000,000                                    
Voluntary prepayment premium percentage                               1.00%      
Borrowings under the senior secured credit facility                 250,000,000             $ 250,000,000      
2018 Credit Facility [Member] | 2018 Term Loan A [Member] | Level 2 [Member]                                      
Debt Instrument [Line Items]                                      
Outstanding principal amount                 248,500,000             248,500,000      
Debt instrument, fair value                 253,000,000             $ 253,000,000      
2018 Credit Facility [Member] | 2018 Term Loan A [Member] | 2019 Convertible Notes Exceeds 350 Million [Member]                                      
Debt Instrument [Line Items]                                      
Credit facility, maturity date Feb. 14, 2019                                    
2018 Credit Facility [Member] | 2018 Term Loan A [Member] | Base Rate [Member]                                      
Debt Instrument [Line Items]                                      
Interest rate spread on variable rate 3.00%                                    
2018 Credit Facility [Member] | 2018 Term Loan A [Member] | Eurodollar [Member]                                      
Debt Instrument [Line Items]                                      
Interest rate spread on variable rate 3.00%                                    
2018 Credit Facility [Member] | 2018 Term Loan B [Member]                                      
Debt Instrument [Line Items]                                      
Credit facility, maturity date Aug. 18, 2025                                    
Outstanding principal amount $ 750,000,000                                    
Senior secured credit facility, discount percentage 0.25%                                    
Senior secured credit facility, discount amount $ 1,900,000                                    
Voluntary prepayment premium percentage                               1.00%      
Borrowings under the senior secured credit facility                 750,000,000             $ 750,000,000      
2018 Credit Facility [Member] | 2018 Term Loan B [Member] | Level 2 [Member]                                      
Debt Instrument [Line Items]                                      
Outstanding principal amount                 739,800,000             739,800,000      
Debt instrument, fair value                 758,900,000             758,900,000      
2018 Credit Facility [Member] | 2018 Term Loan B [Member] | 2019 Convertible Notes Exceeds 350 Million [Member]                                      
Debt Instrument [Line Items]                                      
Credit facility, maturity date May 16, 2019                                    
2018 Credit Facility [Member] | 2018 Term Loan B [Member] | 2024 Convertible Notes Exceeds 350 Million [Member]                                      
Debt Instrument [Line Items]                                      
Credit facility, maturity date Dec. 15, 2023                                    
2018 Credit Facility [Member] | 2018 Term Loan B [Member] | Base Rate [Member]                                      
Debt Instrument [Line Items]                                      
Interest rate spread on variable rate 2.25%                                    
2018 Credit Facility [Member] | 2018 Term Loan B [Member] | Eurodollar [Member]                                      
Debt Instrument [Line Items]                                      
Interest rate spread on variable rate 3.25%                                    
2018 Credit Facility [Member] | 2018 Revolving Credit Facility [Member]                                      
Debt Instrument [Line Items]                                      
Credit facility, maximum amount $ 250,000,000                                    
Credit facility, maturity date Aug. 16, 2023                                    
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.50%                                    
Borrowings under the senior secured credit facility                 $ 0             $ 0      
2018 Credit Facility [Member] | 2018 Revolving Credit Facility [Member] | 2019 Convertible Notes Exceeds 350 Million [Member]                                      
Debt Instrument [Line Items]                                      
Credit facility, maturity date Feb. 14, 2019                                    
2018 Credit Facility [Member] | 2018 Revolving Credit Facility [Member] | Base Rate [Member]                                      
Debt Instrument [Line Items]                                      
Interest rate spread on variable rate 2.00%                                    
2018 Credit Facility [Member] | 2018 Revolving Credit Facility [Member] | Eurodollar [Member]                                      
Debt Instrument [Line Items]                                      
Interest rate spread on variable rate 2.00%                                    
Senior Unsecured Notes [Member]                                      
Debt Instrument [Line Items]                                      
Aggregate principal amount of convertible senior notes issued $ 400,000,000