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Long-Term Debt - Notes (Details) - USD ($) |  | 6 Months Ended
--- | --- | ---
Mar. 21, 2019 | Jun. 30, 2019 | Jun. 30, 2018
Debt Instrument |  |  |
Proceeds from borrowings of long-term debt |  | $ 1,254,000,000 | $ 383,830,000
Senior Notes | 2027 Notes |  |  |
Debt Instrument |  |  |
Debt instrument face amount | $ 500,000,000.0 |  |
Interest rate (as a percent) | 6.875% |  |
Proceeds from borrowings of long-term debt | $ 491,200,000 |  |
Debt issuance cost | $ 8,800,000 |  |

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