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Investments - Carrying Amount of Equity Method Limited Partnership Interests (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Equity Method Investments |  |
Limited partnership interests | $ 1,119.3 | $ 1,138.8
Commercial mortgage loan funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | 646.2 | 660.8
Real estate equity funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | 103.3 | 109.2
Private equity funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | 95.5 | 92.7
Infrastructure equity funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | 78.0 | 77.2
Infrastructure debt funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | 62.4 | 59.1
Other funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | $ 133.9 | $ 139.8

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