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Equity-Method Eligible Investments - Equity Method Investments Financial Data (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]      
Total assets $ 7,356.7   $ 7,000.7
Total liabilities 3,687.4   3,296.0
Total revenues 348.9 $ 178.2  
Net income (loss) 33.4 (75.3)  
Marketing Technology (MediaAlpha)      
Schedule of Equity Method Investments [Line Items]      
Total assets 275.2   289.8
Total liabilities 332.9   $ 351.4
Total revenues 142.6 173.6  
Total expenses 152.4 173.4  
Net income (loss) $ (9.8) $ 0.2