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Fair Value of Assets and Liabilities - Narrative (Details) - Senior Notes
Sep. 30, 2019
Debt Instrument [Line Items]  
Interest rate 5.875%
5.875% Senior Notes due 2022  
Debt Instrument [Line Items]  
Interest rate 5.875%
5.875% Senior Notes due 2024  
Debt Instrument [Line Items]  
Interest rate 5.875%
6.00% Senior Notes due 2026  
Debt Instrument [Line Items]  
Interest rate 6.00%
5.125% Senior Notes, due 2023  
Debt Instrument [Line Items]  
Interest rate 5.125%