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Fair Value Measurements - Schedule of Carrying Amounts and Estimated Fair Values, Financial Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Term loan facilities | Term loan facilities | Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments $ 245.1 $ 251.6
Term loan facilities | Term loan facilities | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments $ 246.4 253.1
Senior Notes | 5.125% Senior Notes due 2023    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instrument interest rate (percent) 5.125%  
Senior Notes | 5.125% Senior Notes due 2023 | Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments $ 99.5 298.1
Senior Notes | 5.125% Senior Notes due 2023 | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments $ 100.3 302.6
Senior Notes | 5.75% Senior Notes due 2025    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instrument interest rate (percent) 5.75%  
Senior Notes | 5.75% Senior Notes due 2025 | Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments $ 346.6 346.3
Senior Notes | 5.75% Senior Notes due 2025 | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments $ 359.7 361.4
Senior Notes | 4.50% Senior Notes due 2028    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instrument interest rate (percent) 4.50%  
Senior Notes | 4.50% Senior Notes due 2028 | Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments $ 785.9 785.0
Senior Notes | 4.50% Senior Notes due 2028 | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments $ 831.2 840.0
Senior Notes | 4.75% Senior Notes due 2030    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instrument interest rate (percent) 4.75%  
Senior Notes | 4.75% Senior Notes due 2030 | Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments $ 783.9 783.2
Senior Notes | 4.75% Senior Notes due 2030 | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments $ 851.0 856.0
Senior Notes | 4.625% Senior Notes due 2031    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instrument interest rate (percent) 4.625%  
Senior Notes | 4.625% Senior Notes due 2031 | Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments $ 393.4 393.2
Senior Notes | 4.625% Senior Notes due 2031 | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments 429.7 424.9
Other notes payable | Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments 50.2 39.8
Other notes payable | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments 50.2 39.8
Advances under revolving credit facility | Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments 45.0 0.0
Advances under revolving credit facility | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments 45.0 0.0
Letters of credit | Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments 0.0 0.0
Letters of credit | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments $ 38.0 $ 36.7