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Investments - Carrying Amount of Equity Method Limited Partnership Interests (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Schedule of Equity Method Investments |  |
Limited partnership interests (Carried under Fair Value Option, 2025 $34900000 and 2024, $28900000) | $ 1,125.6 | $ 1,121.3
Commercial mortgage loan funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests (Carried under Fair Value Option, 2025 $34900000 and 2024, $28900000) | 590.5 | 596.0
Real estate equity funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests (Carried under Fair Value Option, 2025 $34900000 and 2024, $28900000) | 145.5 | 144.7
Private equity funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests (Carried under Fair Value Option, 2025 $34900000 and 2024, $28900000) | 107.5 | 102.2
Infrastructure equity funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests (Carried under Fair Value Option, 2025 $34900000 and 2024, $28900000) | 88.6 | 81.7
Infrastructure debt funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests (Carried under Fair Value Option, 2025 $34900000 and 2024, $28900000) | 64.7 | 69.0
Other funds |  |
Schedule of Equity Method Investments |  |
Limited partnership interests (Carried under Fair Value Option, 2025 $34900000 and 2024, $28900000) | $ 128.8 | $ 127.7

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