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Long-term Debt - Long-term Debt Outstanding (Details) - USD ($)
Dec. 31, 2020
Nov. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Sep. 30, 2015
Mar. 31, 2015
Sep. 30, 2012
Schedule of Outstanding Long-term Debt              
Finance lease obligations $ 391,700,000   $ 384,100,000        
Total debt and Capital lease obligations 3,288,900,000   3,062,600,000        
Less: Current portion (38,300,000)   (39,300,000)        
Long-term debt, net of current portion 3,250,600,000   3,023,300,000        
Term Loan Facilities | Term loan facilities              
Schedule of Outstanding Long-term Debt              
Total debt $ 251,600,000   $ 265,200,000        
Senior Notes | 5.125% Senior Notes due 2023              
Schedule of Outstanding Long-term Debt              
Debt instrument interest rate (percent) 5.125%   5.125%     5.125%  
Total debt $ 298,100,000   $ 297,300,000        
Senior Notes | 5.75% Senior Notes due 2024              
Schedule of Outstanding Long-term Debt              
Debt instrument interest rate (percent) 5.75%   5.75%       5.75%
Total debt $ 0 $ 700,000,000 $ 697,300,000        
Senior Notes | 5.75% Senior Notes due 2025              
Schedule of Outstanding Long-term Debt              
Debt instrument interest rate (percent) 5.75%   5.75%   5.75%    
Total debt $ 346,300,000   $ 345,600,000        
Senior Notes | 4.50% Senior Notes due 2028              
Schedule of Outstanding Long-term Debt              
Debt instrument interest rate (percent) 4.50%   4.50% 4.50%      
Total debt $ 785,000,000.0   $ 491,700,000        
Senior Notes | 4.75% Senior Notes due 2030              
Schedule of Outstanding Long-term Debt              
Debt instrument interest rate (percent) 4.75%   4.75% 4.75%      
Total debt $ 783,200,000   $ 491,700,000        
Senior Notes | 4.625% Senior Notes due 2031              
Schedule of Outstanding Long-term Debt              
Debt instrument interest rate (percent) 4.625%            
Total debt $ 393,200,000   0        
Other Notes Payable              
Schedule of Outstanding Long-term Debt              
Total debt 39,800,000   44,700,000        
Revolving Credit Facility              
Schedule of Outstanding Long-term Debt              
Total debt $ 0   $ 45,000,000.0