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Equity-Method Eligible Investments - Equity Method Investments Financial Data (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]          
Total assets $ 7,113.6   $ 7,113.6   $ 4,831.4
Total liabilities 3,459.3   3,459.3   1,013.5
Total revenues (10.1) $ 459.5 594.8 $ 659.9  
Net (loss) income (371.4) 232.9 (308.2) 219.5  
Marketing Technology (MediaAlpha)          
Schedule of Equity Method Investments [Line Items]          
Total assets 245.5   245.5   210.3
Total liabilities 318.4   318.4   $ 315.5
Total revenues 152.7 151.5 483.7 394.6  
Total expenses 157.0 146.7 488.2 370.8  
Net (loss) income $ (4.3) $ 4.8 $ (4.5) $ 23.8