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Investments - Carrying Amount of Equity Method Limited Partnership Interests (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
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Schedule of Equity Method Investments |  |
Limited partnership interests | $ 1,045.4 | $ 983.7
Commercial mortgage loan funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | 623.7 | 593.6
Private equity funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | 77.7 | 76.3
Infrastructure equity funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | 62.6 | 60.0
Real estate equity funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | 87.7 | 71.3
Infrastructure debt funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | 73.2 | 72.0
Other funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | $ 120.5 | $ 110.5

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