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Long-term Debt - Long-term Debt Outstanding (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Schedule of Outstanding Long-term Debt    
Finance lease obligations $ 422.9 $ 391.7
Total debt and finance lease obligations 3,172.5 3,288.9
Less: Current portion (66.8) (38.3)
Long-term debt, net of current portion 3,105.7 3,250.6
Term loan facilities | Term loan facilities    
Schedule of Outstanding Long-term Debt    
Total debt $ 245.1 251.6
Senior Notes | 5.125% Senior Notes due 2023    
Schedule of Outstanding Long-term Debt    
Debt instrument interest rate (percent) 5.125%  
Total debt $ 99.5 298.1
Senior Notes | 5.75% Senior Notes due 2025    
Schedule of Outstanding Long-term Debt    
Debt instrument interest rate (percent) 5.75%  
Total debt $ 346.6 346.3
Senior Notes | 4.50% Senior Notes due 2028    
Schedule of Outstanding Long-term Debt    
Debt instrument interest rate (percent) 4.50%  
Total debt $ 785.9 785.0
Senior Notes | 4.75% Senior Notes due 2030    
Schedule of Outstanding Long-term Debt    
Debt instrument interest rate (percent) 4.75%  
Total debt $ 783.9 783.2
Senior Notes | 4.625% Senior Notes due 2031    
Schedule of Outstanding Long-term Debt    
Debt instrument interest rate (percent) 4.625%  
Total debt $ 393.4 393.2
Other notes payable    
Schedule of Outstanding Long-term Debt    
Total debt 50.2 39.8
Advances under revolving credit facility    
Schedule of Outstanding Long-term Debt    
Total debt $ 45.0 $ 0.0