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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 |

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