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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
Sep. 30, 2020
USD ($)
shares
Apr. 14, 2020
USD ($)
May 31, 2020
USD ($)
Jan. 31, 2017
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
May 14, 2020
$ / shares
Dec. 31, 2019
USD ($)
Oct. 15, 2018
USD ($)
Debt Instrument [Line Items]                  
Interest rate 5.625%       5.625%        
Proceeds from issuance of long-term debt, net of discounts         $ 322,200,000 $ 0      
Principal $ 2,566,100,000       2,566,100,000     $ 2,419,000,000.0  
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              
Commitment fee on unused capacity   0.50%              
Basis spread on variable rate, floor   0.75%              
Senior Secured Credit Facility | Base Rate                  
Debt Instrument [Line Items]                  
Basis spread on variable rate   2.00%              
Senior Secured Credit Facility | LIBOR Rate                  
Debt Instrument [Line Items]                  
Basis spread on variable rate   3.00%              
Senior Secured Credit Facility | Minimum                  
Debt Instrument [Line Items]                  
Covenant relief period, maximum consolidated total net leverage ratio in 2021   4.50              
Covenant relief period, maximum senior secured net leverage ratio in 2021   3.50              
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 senior secured net leverage ratio in 2021   4.50              
Senior Secured Credit Facility | Through April 30, 2020                  
Debt Instrument [Line Items]                  
Covenant relief period, minimum liquidity covenant   $ 400,000,000.0              
Senior Secured Credit Facility | May 1, 2020 through May 31, 2020                  
Debt Instrument [Line Items]                  
Covenant relief period, minimum liquidity covenant   350,000,000.0              
Senior Secured Credit Facility | June 1, 2020 through June 30, 2020                  
Debt Instrument [Line Items]                  
Covenant relief period, minimum liquidity covenant   300,000,000.0              
Senior Secured Credit Facility | July 1, 2020 through March 31, 2021                  
Debt Instrument [Line Items]                  
Covenant relief period, minimum liquidity covenant   $ 225,000,000.0              
Senior Secured Credit Facilities | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Debt instrument, term       5 years          
Maximum borrowing capacity       $ 700,000,000.0          
Letters of credit outstanding 29,400,000       29,400,000        
Senior Secured Credit Facilities | Term Loan A Facility                  
Debt Instrument [Line Items]                  
Debt instrument, term       5 years          
Maximum borrowing capacity       $ 300,000,000.0          
Senior Secured Credit Facilities | Term Loan B Facility                  
Debt Instrument [Line Items]                  
Debt instrument, term       7 years          
Maximum borrowing capacity       $ 500,000,000.0          
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                 $ 1,128,800,000
Principal $ 1,109,000,000.0       $ 1,109,000,000.0     $ 1,117,500,000  
Senior Notes | 5.625% Notes due 2027                  
Debt Instrument [Line Items]                  
Interest rate 5.625%     5.625% 5.625%     5.625%  
Debt principal amount       $ 400,000,000.0          
Principal $ 400,000,000.0       $ 400,000,000.0     $ 400,000,000.0  
Senior Notes | 2.75% Convertible Notes due 2026 | Debt Instrument, Redemption, Period One                  
Debt Instrument [Line Items]                  
Debt Instrument, convertible, conversion ratio     0.042735            
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%   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 $ 1,004,300,000                
Carrying amount of equity component $ 88,200,000   91,800,000   $ 88,200,000        
Debt issuance costs     10,200,000            
Effective yield 9.23%       9.23%        
Remaining period over which unamortized discount will be amortized         5 years 7 months 6 days        
Principal $ 330,500,000       $ 330,500,000     $ 0  
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