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Investments - Carrying Amount of Equity Method Limited Partnership Interests (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
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Schedule of Equity Method Investments |  |
Limited partnership interests | $ 1,073.8 | $ 983.7
Commercial mortgage loan funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | 642.7 | 593.6
Private equity funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | 80.6 | 76.3
Infrastructure equity funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | 62.8 | 60.0
Real estate equity funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | 86.8 | 71.3
Infrastructure debt funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | 72.4 | 72.0
Other funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | $ 128.5 | $ 110.5

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