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v3.20.1

Basis of Presentation and Recent Developments (Details) - 6.50% Notes due 2024 - Senior Notes - USD ($) | 1 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2020 | Mar. 31, 2019 | Mar. 23, 2016
Debt [Line Items] |  |  |
Aggregate principal amount |  |  | $ 900,000,000
Interest rate, stated percentage |  | 6.50% | 6.50%
Subsequent Event [Member] |  |  |
Debt [Line Items] |  |  |
Debt Acquired | $ 30,000,000 |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed | 74.00% |  |
Long-term Debt | $ 22,000,000 |  |
Long-term Debt, Accrued Interest | 1,000,000 |  |
Gain (Loss) on Extinguishment of Debt | $ 8,000,000 |  |

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