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Debt Obligations - Debt Repurchases & Extinguishments - Additional Information (Details) - USD ($) $ in Millions |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 01, 2020 | Nov. 30, 2020 | Feb. 28, 2019 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Aug. 31, 2020 | Jan. 31, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Write-off debt issuance cost |  |  |  | $ 2.4 |  |  |  |  |
Debt repurchased, payment |  |  |  | 239.8 |  |  |  |  |
Debt repurchased, book value |  |  |  | 303.3 |  |  |  |  |
Gain (loss) from financing activities |  |  |  | 61.1 | $ 45.6 | $ (1.4) | $ (2.0) |  |
Debt repurchased, gain |  |  |  | $ 63.5 | $ 45.6 | $ (1.4) | $ (2.0) |  |
Senior Unsecured 6¾% Notes due March 2024 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Write-off debt issuance cost | $ 2.6 |  |  |  |  |  |  |  |
Face amount of notes redeemed | 318.0 |  |  |  |  |  |  | $ 262.1 |
Loss due to debt extinguishments | 13.7 |  |  |  |  |  |  |  |
Premium Paid | $ 11.1 |  |  |  |  |  |  |  |
Senior Unsecured 5¼% Notes due May 2023 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount of notes redeemed |  | $ 559.6 |  |  |  |  |  |  |
Loss due to debt extinguishments |  | $ 1.8 |  |  |  |  |  |  |
Senior Unsecured Notes [Member] | Senior Unsecured 4 1/8% notes due November 2019 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate on fixed rate debt |  |  |  |  |  |  |  |  | 4.125%
Senior Unsecured Notes [Member] | Senior Unsecured 6¾% Notes due March 2024 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate on fixed rate debt | 6.75% |  |  |  |  |  |  | 6.75% |
Senior Unsecured Notes [Member] | Senior Unsecured 5¼% Notes due May 2023 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate on fixed rate debt |  | 5.25% |  |  |  |  |  |  |
Partnership Issuers [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 4 1/8% notes due November 2019 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Redemption price, percentage of face value |  |  | 4.125% |  |  |  |  |  |
Maturity year |  |  | 2019 |  |  |  |  |  |
Write-off debt issuance cost |  |  | $ 1.4 |  |  |  |  |  |

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