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Investments - Carrying Amount of Equity Method Limited Partnership Interests (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
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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+ References

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