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Investments - Carrying Amount of Equity Method Limited Partnership Interests (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Equity Method Investments |  |
Limited partnership interests | $ 1,111.7 | $ 1,138.8
Commercial mortgage loan funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | 626.9 | 660.8
Real estate equity funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | 102.9 | 109.2
Private equity funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | 99.8 | 92.7
Infrastructure equity funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | 79.4 | 77.2
Infrastructure debt funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | 64.4 | 59.1
Other funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | $ 138.3 | $ 139.8

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