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Equity Method Eligible Investments - Balance Sheet and Income Statement Tables (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Investments in unconsolidated affiliates      
Total assets $ 8,385.9 $ 7,389.3  
Total liabilities 3,824.3 3,454.3  
Total revenues 2,166.7 1,157.9 $ 614.4
Total expenses 1,601.3 1,307.3 888.0
Net income (loss) 580.9 712.4 (321.9)
MediaAlpha      
Investments in unconsolidated affiliates      
Total assets 153.9 170.1  
Total liabilities 248.4 256.2  
Total revenues 388.1 459.1 645.3
Total expenses 444.7 531.5 653.8
Net income (loss) (56.6) (72.4) (8.5)
Equity Method Investment, Nonconsolidated Investee, Excluding MediaAlpha      
Investments in unconsolidated affiliates      
Total assets 3,049.3 2,252.5  
Total liabilities 657.2 526.9  
Total revenues 1,187.3 735.3 987.4
Total expenses 681.5 515.9 418.7
Net income (loss) $ 505.8 $ 219.4 $ 568.7