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Long-term Debt - Senior Secured Credit Facilities, Senior Unsecured Notes, Unsecured Convertible Notes, and Covenants (Details)
1 Months Ended 9 Months Ended
Apr. 14, 2020
May 31, 2020
USD ($)
$ / shares
Jan. 31, 2017
USD ($)
Sep. 30, 2021
USD ($)
shares
Sep. 30, 2020
USD ($)
Jul. 01, 2021
USD ($)
Dec. 31, 2020
USD ($)
Oct. 15, 2018
USD ($)
Jan. 19, 2017
USD ($)
Debt Instrument [Line Items]                  
Proceeds from issuance of long-term debt, net of discounts       $ 400,000,000.0 $ 322,200,000        
Debt Instrument, Redemption, Period One                  
Debt Instrument [Line Items]                  
Threshold percentage of stock price   130.00%              
Debt Instrument, Redemption, Period Two                  
Debt Instrument [Line Items]                  
Threshold percentage of stock price   98.00%              
Debt Instrument, Redemption, Period Three                  
Debt Instrument [Line Items]                  
Threshold percentage of stock price   100.00%              
Senior Secured Credit Facility                  
Debt Instrument [Line Items]                  
Covenant relief period, consolidated total net leverage ratio thereafter 4.25                
Covenant relief period, maximum senior secured net leverage ratio thereafter 3.00                
Covenant relief period, minimum interest coverage ratio 2.50                
Senior Secured Credit Facility | Maximum                  
Debt Instrument [Line Items]                  
Covenant relief period, maximum consolidated total net leverage ratio in 2021 5.50                
Covenant relief period, maximum consolidated total net leverage ratio in June 30, 2021 5.00                
Covenant relief period, maximum consolidated total net leverage ratio in September 30, 2021 4.75                
Covenant relief period, maximum consolidated total net leverage ratio in December 30, 2021 4.50                
Covenant relief period, maximum senior secured net leverage ratio in March 31, 2021 4.50                
Covenant relief period, maximum senior secured net leverage ratio in June 30, 2021 4.00                
Covenant relief period, maximum senior secured net leverage ratio in September 30, 2021 3.75                
Covenant relief period, maximum senior secured net leverage ratio in December 31, 2021 3.50                
Senior Secured Credit Facilities | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Debt instrument, term     5 years            
Maximum borrowing capacity     $ 700,000,000            
Letters of credit outstanding       26,400,000     $ 28,200,000    
Available borrowing capacity       $ 673,600,000     $ 671,800,000    
Senior Secured Credit Facilities | Term Loan A Facility                  
Debt Instrument [Line Items]                  
Debt instrument, term     5 years            
Maximum borrowing capacity     $ 300,000,000            
Senior Secured Credit Facilities | Term Loan B Facility                  
Debt Instrument [Line Items]                  
Debt instrument, term     7 years            
Maximum borrowing capacity     $ 500,000,000            
Senior Secured Credit Facilities | Term Loan A Facility due 2023, incremental loans                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity               $ 430,200,000  
Senior Secured Credit Facilities | Term Loan B-1 Facility due 2025                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity               $ 1,100,000,000  
Basis spread on variable rate, floor       0.75%          
Senior Secured Credit Facilities | Term Loan B-1 Facility due 2025 | LIBOR Rate                  
Debt Instrument [Line Items]                  
Basis spread on variable rate       2.25%          
Senior Secured Credit Facilities | Term Loan B-1 Facility due 2025 | Base Rate                  
Debt Instrument [Line Items]                  
Basis spread on variable rate       1.25%          
Senior Secured Credit Facilities | Term Loan A Facility due 2023 | Minimum | LIBOR Rate                  
Debt Instrument [Line Items]                  
Basis spread on variable rate       1.25%          
Senior Secured Credit Facilities | Term Loan A Facility due 2023 | Minimum | Base Rate                  
Debt Instrument [Line Items]                  
Basis spread on variable rate       0.25%          
Senior Secured Credit Facilities | Term Loan A Facility due 2023 | Maximum | LIBOR Rate                  
Debt Instrument [Line Items]                  
Basis spread on variable rate       3.00%          
Senior Secured Credit Facilities | Term Loan A Facility due 2023 | Maximum | Base Rate                  
Debt Instrument [Line Items]                  
Basis spread on variable rate       2.00%          
Senior Secured Credit Facilities | Revolving Credit Facility due 2023 | Minimum                  
Debt Instrument [Line Items]                  
Commitment fee on unused capacity       0.20%          
Senior Secured Credit Facilities | Revolving Credit Facility due 2023 | Maximum                  
Debt Instrument [Line Items]                  
Commitment fee on unused capacity       0.50%          
Senior Notes | 5.625% Notes due 2027                  
Debt Instrument [Line Items]                  
Interest rate       5.625%     5.625%   5.625%
Debt principal amount                 $ 400,000,000
Senior Notes | 4.125% Notes due 2029                  
Debt Instrument [Line Items]                  
Interest rate       4.125%   4.125%      
Debt principal amount           $ 400,000,000      
Senior Notes | 2.75% Convertible Notes due 2026 | Debt Instrument, Redemption, Period One                  
Debt Instrument [Line Items]                  
Debt Instrument, convertible, conversion ratio   0.0427350              
Senior Notes | 2.75% Convertible Notes due 2026 | Debt Instrument, Redemption, Period Three                  
Debt Instrument [Line Items]                  
Debt Instrument, convertible, conversion ratio   0.0555555              
Convertible Notes | 2.75% Convertible Notes due 2026                  
Debt Instrument [Line Items]                  
Interest rate   2.75%   2.75%          
Debt principal amount   $ 330,500,000              
Proceeds from issuance of long-term debt, net of discounts   $ 322,200,000              
Conversion price (in dollars per share) | $ / shares   $ 23.40              
Number of shares issued upon conversion (in shares) | shares       18,360,815          
Amount if-converted value exceeds its principal amount       $ 999,900,000          
Carrying amount of equity component   $ 91,800,000   $ 88,200,000     $ 88,200,000    
Debt issuance costs   10,200,000              
Effective yield       9.23%          
Remaining period over which unamortized discount will be amortized       4 years 7 months 6 days          
Convertible Notes | Convertible Notes Due 2026, Liability Component                  
Debt Instrument [Line Items]                  
Debt issuance costs   6,600,000              
Convertible Notes | Convertible Notes Due 2026, Equity Component                  
Debt Instrument [Line Items]                  
Debt issuance costs   $ 3,600,000