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Fair Value of Assets and Liabilities - Additional Information (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Feb. 25, 2021 | Dec. 31, 2020
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5.875% Senior Notes due 2022 |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Stated interest rate | 5.875% |  | 5.875%
5.875% Senior Notes due 2024 |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Stated interest rate | 5.875% |  | 5.875%
6.00% Senior Notes due 2026 |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Stated interest rate | 6.00% |  | 6.00%
5.125% Senior Notes due 2023 |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Stated interest rate | 5.125% |  | 5.125%
6.50% Exchangeable Senior Notes due 2026 |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Stated interest rate | 6.50% |  |
Debt instrument, face amount |  | $ 230 |

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