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 6 Months Ended
Apr. 24, 2018
Jun. 30, 2017
USD ($)
Feb. 15, 2017
USD ($)
Sep. 30, 2015
USD ($)
May 04, 2015
USD ($)
Mar. 31, 2018
USD ($)
$ / shares
Feb. 28, 2014
USD ($)
$ / shares
Jun. 30, 2018
USD ($)
$ / shares
Mar. 31, 2018
USD ($)
$ / shares
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2014
USD ($)
Jun. 30, 2018
USD ($)
Day
d
$ / shares
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Jul. 26, 2012
USD ($)
Mar. 09, 2011
USD ($)
Debt Instrument [Line Items]                                  
Deferred financing costs         $ 6,200,000                        
Outstanding principal amount               $ 2,410,700,000         $ 2,410,700,000        
Interest expense               49,100,000     $ 41,900,000   93,700,000 $ 74,400,000      
Stock split conversion ratio 2           2                    
Paid-in-capital in excess of par value               389,400,000         389,400,000   $ 407,300,000    
Long-term debt               2,200,700,000         2,200,700,000   2,268,100,000    
Convertible notes paid                         582,500,000        
Letters of credit issued but undrawn               37,500,000         37,500,000        
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]                                  
Deferred financing costs                       26,600,000          
Outstanding principal amount             1,150,000,000 675,000,000         675,000,000   1,150,000,000    
Interest expense               10,400,000   $ 17,000,000     27,400,000 33,700,000      
Non-cash interest expense               6,400,000   10,200,000     16,800,000 20,200,000      
Amortization of deferred financing costs               $ 600,000   1,000,000     $ 1,600,000 2,000,000      
Aggregate principal amount of convertible senior notes issued             1,000,000,000                    
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               $ 637,700,000         $ 637,700,000   1,066,000,000    
Unamortized debt discount and debt issuance costs               33,000,000         33,000,000   80,000,000    
Convertible senior notes, carrying value of liability component               642,000,000         642,000,000   1,070,000,000    
Convertible Senior Notes Due 2019 [Member] | Repurchase of 2019 Convertible Notes [Member]                                  
Debt Instrument [Line Items]                                  
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                      
Loss on extinguishment of debt           13,100,000             13,100,000        
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]                                  
Deferred financing costs           12,900,000     12,900,000                
Outstanding principal amount               550,000,000         550,000,000        
Interest expense               8,500,000         9,300,000        
Non-cash interest expense               4,500,000         5,000,000        
Amortization of deferred financing costs               $ 300,000         $ 300,000        
Aggregate principal amount of convertible senior notes issued           $ 550,000,000     $ 550,000,000                
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               $ 423,200,000         $ 423,200,000        
Unamortized debt discount and debt issuance costs               144,200,000         144,200,000        
Convertible senior notes, carrying value of liability component               405,800,000         $ 405,800,000        
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 secured prior revolving credit facility [Member]                                  
Debt Instrument [Line Items]                                  
Repayment of prior senior secured credit facility     $ 410,000,000                            
Credit facility, amount repaid                     $ 410,000,000            
Prior Senior Secured Credit Facility [Member]                                  
Debt Instrument [Line Items]                                  
Credit facility amendment date                         May 04, 2015        
Credit facility interest rate description                         After March 9, 2016, the applicable interest rates on the Company’s borrowings under the Prior Credit Facility increased by 2.00% such that borrowings under the Prior Credit Facility began bearing interest at either LIBOR plus the applicable margin between 4.00% and 5.00% or the base rate plus the applicable margin between 3.00% and 4.00%        
Senior secured revolving credit facility [Member]                                  
Debt Instrument [Line Items]                                  
Borrowings under the senior secured credit facility               0         $ 0   0    
Term Loan [Member]                                  
Debt Instrument [Line Items]                                  
Quarterly periodic payment, Principal   $ 24,400,000                              
Interest expense               24,500,000   23,400,000     48,200,000 34,600,000      
Non-cash interest expense               1,200,000   1,200,000     2,300,000 1,800,000      
Amortization of deferred financing costs               700,000   800,000     1,500,000 $ 1,200,000      
Term Loan [Member] | Level 2 [Member]                                  
Debt Instrument [Line Items]                                  
Outstanding principal amount               1,145,300,000         1,145,300,000   1,190,200,000    
Debt instrument, fair value               $ 1,189,200,000         $ 1,189,200,000   $ 1,226,100,000    
Base Rate [Member] | Senior secured prior revolving credit facility [Member]                                  
Debt Instrument [Line Items]                                  
Variable rate basis                         Facility increased by 2.00% such that borrowings under the Prior Credit Facility began bearing interest at either LIBOR plus the applicable margin between 4.00% and 5.00% or the base rate plus the applicable margin between 3.00% and 4.00%        
Base rate interest rate floor     1.75%                            
Senior Secured Credit Facility [Member]                                  
Debt Instrument [Line Items]                                  
Credit facility, maximum amount     $ 1,450,000,000                            
Deferred financing costs     $ 22,600,000                            
Credit Facility amended, effective date                         Mar. 16, 2018        
Senior secured credit facility, discount percentage     2.00%                            
Senior secured credit facility, discount amount     $ 26,000,000                            
Line of credit facility, frequency of interest payments     quarterly                            
Amount required to maintain on consolidated cash and cash equivalents                         $ 200,000,000        
Long-term debt, weighted average interest rate               7.34%         7.34%   6.79%    
Credit facility, amount repaid               $ 24,400,000 $ 24,400,000 $ 24,400,000              
Borrowings under the senior secured credit facility               1,145,300,000         $ 1,145,300,000   $ 1,190,200,000    
Senior Secured Credit Facility [Member] | Senior secured prior revolving credit facility [Member]                                  
Debt Instrument [Line Items]                                  
Line of credit facility extended maturity period                         1 year        
Credit facility prepayments         50,900,000                        
Credit facility, maximum amount               425,000,000         $ 425,000,000       $ 700,000,000
Amended maturity date of credit facility                         Mar. 09, 2017        
Decreased amount in credit facility borrowing capacity       $ (39,100,000) (235,900,000)                        
Foreign currency borrowings, outstanding               0         $ 0   0    
Senior Secured Credit Facility [Member] | Senior secured revolving credit facility [Member]                                  
Debt Instrument [Line Items]                                  
Credit facility, maximum amount     $ 150,000,000                            
Credit facility, maturity date                         Feb. 15, 2022        
Credit facility LIBOR minimum floor rate interest     0.75%                            
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage     0.50%                            
Senior Secured Credit Facility [Member] | Senior secured revolving credit facility [Member] | 2019 Convertible Notes Exceeds 250 Million [Member]                                  
Debt Instrument [Line Items]                                  
Credit facility, maturity date                         Feb. 14, 2019        
Senior Secured Credit Facility [Member] | Minimum [Member] | 2019 Convertible Notes Exceeds 250 Million [Member]                                  
Debt Instrument [Line Items]                                  
Outstanding principal amount     $ 250,000,000                            
Senior Secured Credit Facility [Member] | Prior Term Loan [Member]                                  
Debt Instrument [Line Items]                                  
Credit facility prepayments         $ 20,300,000                        
Credit facility, maximum amount                               $ 500,000,000  
Senior Secured Credit Facility [Member] | Term Loan [Member]                                  
Debt Instrument [Line Items]                                  
Outstanding principal amount     $ 1,300,000,000                            
Credit facility, maturity date                         Feb. 15, 2023        
Borrowings under the senior secured credit facility               $ 1,178,100,000         $ 1,178,100,000   $ 1,226,900,000    
Senior Secured Credit Facility [Member] | Term Loan [Member] | 2019 Convertible Notes Exceeds 250 Million [Member]                                  
Debt Instrument [Line Items]                                  
Credit facility, maturity date                         May 16, 2019        
Senior Secured Credit Facility [Member] | LIBOR [Member]                                  
Debt Instrument [Line Items]                                  
Interest rate spread on variable rate     1.00%                            
Senior Secured Credit Facility [Member] | LIBOR [Member] | Senior secured prior revolving credit facility [Member]                                  
Debt Instrument [Line Items]                                  
Credit facility LIBOR minimum floor rate interest         0.25%                        
Senior Secured Credit Facility [Member] | Base Rate [Member] | Term Loan [Member]                                  
Debt Instrument [Line Items]                                  
Interest rate spread on variable rate     4.50%                            
Senior Secured Credit Facility [Member] | Eurodollar [Member] | Term Loan [Member]                                  
Debt Instrument [Line Items]                                  
Interest rate spread on variable rate     5.50%                            
Senior Secured Credit Facility [Member] | Federal Funds Rate [Member]                                  
Debt Instrument [Line Items]                                  
Interest rate spread on variable rate     0.50%                            
Until March 9, 2016 [Member] | Senior Secured Credit Facility [Member]                                  
Debt Instrument [Line Items]                                  
Interest rate spread on variable rate increase by percentage         0.50%                        
After March 9, 2016 [Member] | Senior Secured Credit Facility [Member]                                  
Debt Instrument [Line Items]                                  
Interest rate increased by percentage         2.00%                        
After March 9, 2016 [Member] | Senior Secured Credit Facility [Member] | LIBOR [Member] | Minimum [Member]                                  
Debt Instrument [Line Items]                                  
Interest rate spread on variable rate         4.00%                        
After March 9, 2016 [Member] | Senior Secured Credit Facility [Member] | LIBOR [Member] | Maximum [Member]                                  
Debt Instrument [Line Items]                                  
Interest rate spread on variable rate         5.00%                        
After March 9, 2016 [Member] | Senior Secured Credit Facility [Member] | Base Rate [Member] | Minimum [Member]                                  
Debt Instrument [Line Items]                                  
Interest rate spread on variable rate         3.00%                        
After March 9, 2016 [Member] | Senior Secured Credit Facility [Member] | Base Rate [Member] | Maximum [Member]                                  
Debt Instrument [Line Items]                                  
Interest rate spread on variable rate         4.00%                        
Until August 15, 2017 [Member] | Senior Secured Credit Facility [Member] | Base Rate [Member] | Senior secured revolving credit facility [Member]                                  
Debt Instrument [Line Items]                                  
Interest rate spread on variable rate     3.75%                            
Until August 15, 2017 [Member] | Senior Secured Credit Facility [Member] | Eurodollar [Member] | Senior secured revolving credit facility [Member]                                  
Debt Instrument [Line Items]                                  
Interest rate spread on variable rate     4.75%                            
Scenario Leverage Ratio One [Member] | Senior Secured Credit Facility [Member] | Base Rate [Member] | Senior secured revolving credit facility [Member] | After August 15, 2017 [Member]                                  
Debt Instrument [Line Items]                                  
Interest rate spread on variable rate     3.50%                            
Scenario Leverage Ratio One [Member] | Senior Secured Credit Facility [Member] | Eurodollar [Member] | Senior secured revolving credit facility [Member] | After August 15, 2017 [Member]                                  
Debt Instrument [Line Items]                                  
Interest rate spread on variable rate     4.50%                            
Scenario Leverage Ratio Two [Member] | Senior Secured Credit Facility [Member] | Base Rate [Member] | Senior secured revolving credit facility [Member] | After August 15, 2017 [Member]                                  
Debt Instrument [Line Items]                                  
Interest rate spread on variable rate     3.75%                            
Scenario Leverage Ratio Two [Member] | Senior Secured Credit Facility [Member] | Eurodollar [Member] | Senior secured revolving credit facility [Member] | After August 15, 2017 [Member]                                  
Debt Instrument [Line Items]                                  
Interest rate spread on variable rate     4.75%