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Investments - Carrying Amount of Equity Method Limited Partnership Interests (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Schedule of Equity Method Investments
Limited partnership interests	$ 1,142.6	$ 983.7
Commercial mortgage loan funds
Schedule of Equity Method Investments
Limited partnership interests	671.6	593.6
Real estate equity funds
Schedule of Equity Method Investments
Limited partnership interests	111.2	71.3
Private equity funds
Schedule of Equity Method Investments
Limited partnership interests	83.9	76.3
Infrastructure equity funds
Schedule of Equity Method Investments
Limited partnership interests	77.9	72.0
Infrastructure debt funds
Schedule of Equity Method Investments
Limited partnership interests	63.4	60.0
Other funds
Schedule of Equity Method Investments
Limited partnership interests	$ 134.6	$ 110.5

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