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 |
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 |
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 | 856 |
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 |
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 |
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 |
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 | $ 36.7 |