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Equity-Method Eligible Investments - Equity Method Investments Financial Data (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Assets	$ 8,376.3		$ 8,376.3		$ 7,389.3
Liabilities	4,250.4		4,250.4		3,454.3
Revenues	378.4	$ 76.7	910.3	$ 337.1
Net Income (Loss) Available to Common Stockholders, Basic, Total	19.6	(169.2)	199.1	(135.8)
Marketing Technology (MediaAlpha)
Schedule of Equity Method Investments [Line Items]
Assets	140.2		140.2		170.1
Liabilities	234.6		234.6		$ 256.2
Revenues	84.8	103.4	196.4	246.0
Operating Expenses	104.8	116.4	231.0	268.9
Net Income (Loss) Available to Common Stockholders, Basic, Total	$ (20.0)	$ (13.0)	$ (34.6)	$ (22.9)

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