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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 |  |  |  |

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