Equity Method Eligible Investments - Narrative (Details) - USD ($) $ in Millions	10 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Total revenues		$ 944.8	$ 1,180.7	$ 893.4
Total expenses		1,246.8	535.5	488.3
Net income (loss)		(321.9)	663.4	376.6
Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Proceeds from dividends received		$ 56.2	$ 95.0	$ 14.8
MediaAlpha
Schedule of Equity Method Investments [Line Items]
Total revenues	$ 359.2
Total expenses	336.3
Net income (loss)	$ 22.9