SCHEDULE II - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Derivative Financial Instruments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest rate floor and reinsurance rate cap agreements
Combined liability for interest rate floor and reinsurance rate cap agreements	$ 90.0	$ 91.6
Unrealized gains (losses) on interest rate floor and reinsurance rate cap agreements	$ 1.5	$ (42.7)
Predecessor
Interest rate floor and reinsurance rate cap agreements
Unrealized gains (losses) on interest rate floor and reinsurance rate cap agreements			$ (29.3)