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Investments - Carrying Amount of Equity Method Limited Partnership Interests (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Schedule of Equity Method Investments |  |
Limited partnership interests | $ 828.4 | $ 712.8
Commercial mortgage loan funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | 446.4 | 346.8
Private equity funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | 68.2 | 74.0
Infrastructure debt funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | 68.3 | 62.4
Infrastructure equity funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | 67.3 | 58.3
Other funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests | $ 178.2 | $ 171.3

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