Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Additional Information (Detail)

v3.20.2
Long-Term Debt - Additional Information (Detail)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 19, 2020
USD ($)
Dec. 12, 2019
USD ($)
Aug. 15, 2019
USD ($)
Aug. 16, 2018
USD ($)
Aug. 16, 2018
USD ($)
Feb. 15, 2017
USD ($)
May 31, 2020
USD ($)
Aug. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
$ / shares
Feb. 28, 2014
USD ($)
$ / shares
Sep. 30, 2020
USD ($)
$ / shares
Sep. 30, 2019
USD ($)
Mar. 31, 2018
USD ($)
$ / shares
Mar. 31, 2014
USD ($)
Sep. 30, 2020
USD ($)
Day
$ / shares
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
May 29, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2018
USD ($)
Debt Instrument [Line Items]                                        
Outstanding principal amount                     $ 2,544,300,000       $ 2,544,300,000          
Borrowings under the senior secured credit facility                     981,200,000       981,200,000       $ 965,300,000  
Interest expense                     37,000,000.0 $ 36,700,000     96,400,000 $ 121,500,000        
Paid-in-capital in excess of par value                     335,800,000       335,800,000       366,600,000  
Long-term debt                     2,428,600,000       2,428,600,000       1,803,000,000.0  
Convertible notes paid                               675,000,000.0        
Letters of credit issued but undrawn                     35,600,000       35,600,000          
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                    
Deferred financing costs                           26,600,000            
Aggregate principal amount of convertible senior notes issued                   1,000,000,000                    
Interest expense                     5,400,000       27,000,000.0          
Non-cash interest expense                     3,500,000       17,000,000.0          
Amortization of deferred financing costs                     400,000       1,700,000          
Additional principal amount of convertible notes                   $ 150,000,000                    
Convertible notes, interest rate                   2.00%                    
Convertible notes maturity                   Aug. 15, 2019                    
Principal amount of convertible notes                   $ 1,000                    
Convertible notes conversion rate                   23.1816                    
Convertible notes conversion price | $ / shares                   $ 43.14                    
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     $ 675,000,000.0           $ 583,500,000                      
Accrued interest     $ 6,700,000           1,000,000.0       $ 1,000,000.0              
Convertible Senior Notes Due 2019 [Member] | Repurchase of 2019 Convertible Notes [Member]                                        
Debt Instrument [Line Items]                                        
Loss on extinguishment of debt                 13,100,000                      
Repurchase of convertible notes                 475,000,000.0                      
Fair value of liability to convertible notes                 459,400,000       459,400,000              
Fair value of equity component to convertible notes                 123,000,000.0       123,000,000.0              
Reduction to long-term debt representing liability component of convertible notes                 446,400,000                      
Reduction to additional paid-in capital representing equity component                 123,000,000.0                      
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                     550,000,000.0       550,000,000.0       550,000,000.0  
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                     9,500,000 9,000,000.0     28,100,000 26,700,000        
Non-cash interest expense                     5,500,000 5,100,000     16,200,000 14,900,000        
Amortization of deferred financing costs                     $ 400,000 300,000     $ 1,100,000 1,000,000.0        
Convertible notes, interest rate                 2.625%   2.625%   2.625%   2.625%          
Convertible notes maturity                         Mar. 15, 2024   Mar. 15, 2024          
Principal amount of convertible notes                 $ 1,000           $ 1,000          
Convertible notes conversion rate                 16.0056           16.0352          
Convertible notes conversion price | $ / shares                 $ 62.48   $ 62.36   $ 62.48   $ 62.36          
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                     $ 503,100,000       $ 503,100,000       508,600,000  
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) | 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%                      
Minimum percentage of the product of common share price and conversion rate for convertible notes                 98.00%                      
Deferred financing costs recorded as additional paid-in-capital in excess of par value                 $ 3,300,000       $ 3,300,000              
Unamortized debt discount and debt issuance costs                     95,400,000       $ 95,400,000       112,600,000  
Convertible senior notes, carrying value of liability component                     454,600,000       454,600,000       437,400,000  
Convertible Senior Notes Due 2024 [Member] | Debt Issuance Costs [Member]                                        
Debt Instrument [Line Items]                                        
Deferred financing costs                 $ 9,600,000       $ 9,600,000              
7.875% Senior Notes Due 2025 [Member]                                        
Debt Instrument [Line Items]                                        
Outstanding principal amount                     600,000,000.0       600,000,000.0          
Deferred financing costs                     7,400,000       7,400,000     $ 7,900,000    
Aggregate principal amount of convertible senior notes issued             $ 600,000,000                          
Interest expense                     12,100,000       16,400,000          
Amortization of deferred financing costs                     $ 300,000       $ 400,000          
Convertible notes, interest rate             7.875%       7.875%       7.875%          
Convertible notes maturity             Sep. 01, 2025               Sep. 01, 2025          
Senior notes, redemption price, percentage             100.00%                          
Senior notes, redemption price percentage with equity offerings             107.875%                          
Carrying amount                     $ 592,600,000       $ 592,600,000          
Fair value of notes                     646,100,000       646,100,000          
7.875% Senior Notes Due 2025 [Member] | Debt Issuance Costs [Member]                                        
Debt Instrument [Line Items]                                        
Deferred financing costs                                   $ 7,900,000    
7.875% Senior Notes Due 2025 [Member] | Maximum [Member]                                        
Debt Instrument [Line Items]                                        
Percentage of aggregate principal amount of senior notes being redeemed             40.00%                          
7.250% Senior Notes Due 2026 [Member]                                        
Debt Instrument [Line Items]                                        
Outstanding principal amount                     400,000,000.0       400,000,000.0       400,000,000.0  
Deferred financing costs                     4,300,000       4,300,000       4,700,000 $ 5,400,000
Aggregate principal amount of convertible senior notes issued               $ 400,000,000                        
Interest expense                     7,400,000 7,300,000     22,200,000 22,100,000        
Amortization of deferred financing costs                     $ 100,000 100,000     $ 400,000 400,000        
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                     $ 395,700,000       $ 395,700,000       395,300,000  
Fair value of notes                     $ 410,900,000       $ 410,900,000       $ 424,100,000  
7.250% Senior Notes Due 2026 [Member] | Debt Issuance Costs [Member]                                        
Debt Instrument [Line Items]                                        
Deferred financing costs                                       $ 5,400,000
7.250% Senior Notes Due 2026 [Member] | Maximum [Member]                                        
Debt Instrument [Line Items]                                        
Percentage of aggregate principal amount of senior notes being redeemed               40.00%                        
Eurodollar [Member]                                        
Debt Instrument [Line Items]                                        
Base rate interest rate floor         0.00%                              
2017 Credit Facility [Member]                                        
Debt Instrument [Line Items]                                        
Credit facility, maximum amount           $ 1,450,000,000.0                            
Credit Facility amended, effective date                             Mar. 16, 2018          
Deferred financing costs           $ 22,600,000                            
Credit facility, amount repaid         $ 1,178,100,000                              
2017 Credit Facility [Member] | Other Expense (Income), Net [Member]                                        
Debt Instrument [Line Items]                                        
Loss on extinguishment of debt                                 $ 35,400,000      
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] | LIBOR [Member]                                        
Debt Instrument [Line Items]                                        
Interest rate spread on variable rate           1.00%                            
2017 Credit Facility [Member] | 2017 Revolving Credit Facility [Member]                                        
Debt Instrument [Line Items]                                        
Credit facility, maximum amount           $ 150,000,000.0                            
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%                            
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] | 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 Term Loan B [Member]                                        
Debt Instrument [Line Items]                                        
Outstanding principal amount           $ 1,300,000,000.0                            
Credit facility, maturity date                             Feb. 15, 2023          
Senior secured credit facility, discount percentage           2.00%                            
Senior secured credit facility, discount amount           $ 26,000,000.0                            
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 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] | 2017 Revolving Credit Facility [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 1,250,000,000                              
Deferred financing costs   $ 1,200,000   11,700,000 11,700,000                              
Credit facility, amount repaid                             $ 15,600,000 15,000,000.0        
Credit facility amendment date                             Dec. 12, 2019          
Line of credit facility, frequency of interest payments                             quarterly          
Long-term debt, weighted average interest rate                     3.55%       3.55%       5.52%  
Borrowings under the senior secured credit facility                     $ 989,900,000       $ 989,900,000       $ 975,000,000.0  
Foreign currency borrowings, outstanding                     0       0       0  
Interest expense                     8,000,000.0 14,600,000     29,200,000 44,500,000        
Non-cash interest expense                     100,000 100,000     200,000 200,000        
Amortization of deferred financing costs                     500,000 $ 500,000     $ 1,400,000 $ 1,300,000        
2018 Credit Facility [Member] | 2024 Convertible Notes Exceeds 350 Million [Member] | Minimum [Member]                                        
Debt Instrument [Line Items]                                        
Outstanding principal amount $ 350,000,000.0     350,000,000.0 $ 350,000,000.0                              
2018 Credit Facility [Member] | Second Amendment [Member]                                        
Debt Instrument [Line Items]                                        
Deferred financing costs $ 1,600,000                                      
Credit facility amendment date                             Mar. 19, 2020          
Extended maturity date Mar. 19, 2025                                      
Amortization $ 1,100,000                                      
Recognized in interest expense, net $ 500,000                                      
2018 Credit Facility [Member] | Eurodollar [Member] | Second Amendment [Member]                                        
Debt Instrument [Line Items]                                        
Interest rate spread on variable rate 2.50%       3.00%                              
2018 Credit Facility [Member] | Base Rate [Member]                                        
Debt Instrument [Line Items]                                        
Base rate interest rate floor         1.00%                              
2018 Credit Facility [Member] | Base Rate [Member] | Second Amendment [Member]                                        
Debt Instrument [Line Items]                                        
Interest rate spread on variable rate 1.50%       2.00%                              
2018 Credit Facility [Member] | Federal Funds Rate [Member]                                        
Debt Instrument [Line Items]                                        
Interest rate spread on variable rate         0.50%                              
2018 Credit Facility [Member] | LIBOR [Member]                                        
Debt Instrument [Line Items]                                        
Interest rate spread on variable rate         1.00%                              
2018 Credit Facility [Member] | 2018 Revolving Credit Facility [Member]                                        
Debt Instrument [Line Items]                                        
Credit facility, maximum amount       250,000,000.0 $ 250,000,000.0                              
Credit facility, maturity date         Aug. 16, 2023                              
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage         0.35%                              
Borrowings under the senior secured credit facility                     0       $ 0       0  
2018 Credit Facility [Member] | 2018 Revolving Credit Facility [Member] | Minimum [Member]                                        
Debt Instrument [Line Items]                                        
Credit facility, maximum amount $ 250,000,000.0                                      
2018 Credit Facility [Member] | 2018 Revolving Credit Facility [Member] | Second Amendment [Member]                                        
Debt Instrument [Line Items]                                        
Extended maturity date Mar. 19, 2025                                      
2018 Credit Facility [Member] | 2018 Revolving Credit Facility [Member] | Second Amendment [Member] | Maximum [Member]                                        
Debt Instrument [Line Items]                                        
Credit facility, maximum amount $ 282,500,000                                      
2018 Credit Facility [Member] | 2018 Revolving Credit Facility [Member] | Eurodollar [Member]                                        
Debt Instrument [Line Items]                                        
Interest rate spread on variable rate         1.50%                              
2018 Credit Facility [Member] | 2018 Revolving Credit Facility [Member] | Eurodollar [Member] | Second Amendment [Member]                                        
Debt Instrument [Line Items]                                        
Interest rate spread on variable rate 2.50%       3.00%                              
2018 Credit Facility [Member] | 2018 Revolving Credit Facility [Member] | Base Rate [Member]                                        
Debt Instrument [Line Items]                                        
Interest rate spread on variable rate         1.50%                              
2018 Credit Facility [Member] | 2018 Revolving Credit Facility [Member] | Base Rate [Member] | Second Amendment [Member]                                        
Debt Instrument [Line Items]                                        
Interest rate spread on variable rate 1.50%       2.00%                              
2018 Credit Facility [Member] | 2018 Term Loan A [Member]                                        
Debt Instrument [Line Items]                                        
Outstanding principal amount       250,000,000.0 $ 250,000,000.0                              
Credit facility, maturity date         Aug. 16, 2023                              
Borrowings under the senior secured credit facility                     254,900,000       254,900,000       234,400,000  
2018 Credit Facility [Member] | 2018 Term Loan A [Member] | Level 2 [Member]                                        
Debt Instrument [Line Items]                                        
Outstanding principal amount                     253,700,000       253,700,000       233,200,000  
Debt instrument, fair value                     251,600,000       251,600,000       235,700,000  
2018 Credit Facility [Member] | 2018 Term Loan A [Member] | Minimum [Member]                                        
Debt Instrument [Line Items]                                        
Credit facility, maximum amount $ 234,400,000                                      
2018 Credit Facility [Member] | 2018 Term Loan A [Member] | 2024 Convertible Notes Exceeds 350 Million [Member]                                        
Debt Instrument [Line Items]                                        
Credit facility, maturity date Sep. 15, 2023                                      
2018 Credit Facility [Member] | 2018 Term Loan A [Member] | Second Amendment [Member] | Maximum [Member]                                        
Debt Instrument [Line Items]                                        
Credit facility, maximum amount $ 264,800,000                                      
2018 Credit Facility [Member] | 2018 Term Loan A [Member] | Eurodollar [Member]                                        
Debt Instrument [Line Items]                                        
Interest rate spread on variable rate         2.50%                              
2018 Credit Facility [Member] | 2018 Term Loan A [Member] | Base Rate [Member]                                        
Debt Instrument [Line Items]                                        
Interest rate spread on variable rate         2.50%                              
2018 Credit Facility [Member] | 2018 Term Loan B [Member]                                        
Debt Instrument [Line Items]                                        
Outstanding principal amount       750,000,000.0 $ 750,000,000.0                              
Credit facility, maturity date         Aug. 18, 2025                              
Senior secured credit facility, discount percentage         0.25%                              
Senior secured credit facility, discount amount       $ 1,900,000 $ 1,900,000                              
Borrowings under the senior secured credit facility                     735,000,000.0       735,000,000.0       740,600,000  
2018 Credit Facility [Member] | 2018 Term Loan B [Member] | Level 2 [Member]                                        
Debt Instrument [Line Items]                                        
Outstanding principal amount                     727,500,000       727,500,000       732,100,000  
Debt instrument, fair value                     $ 725,400,000       $ 725,400,000       $ 744,800,000  
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] | Eurodollar [Member]                                        
Debt Instrument [Line Items]                                        
Interest rate spread on variable rate   2.75%   3.25% 2.75%                              
2018 Credit Facility [Member] | 2018 Term Loan B [Member] | Base Rate [Member]                                        
Debt Instrument [Line Items]                                        
Interest rate spread on variable rate   1.75%   2.25% 1.75%                              
Senior Unsecured Notes [Member]                                        
Debt Instrument [Line Items]                                        
Aggregate principal amount of convertible senior notes issued       $ 400,000,000 $ 400,000,000