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Investments - Carrying Amount of Equity Method Limited Partnership Interests (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
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Schedule of Equity Method Investments |  |
Limited partnership interests | $ 801.9 | $ 712.8
Commercial mortgage loan funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | 429.2 | 346.8
Private equity funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | 70.2 | 74.0
Infrastructure debt funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | 62.8 | 62.4
Infrastructure equity funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | 67.2 | 58.3
Other funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | $ 172.5 | $ 171.3

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