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Contingencies and Commitments (Details) $ in Millions	3 Months Ended
	Dec. 31, 2024 USD ($) lawsuit	Mar. 31, 2025 USD ($)
Loss Contingencies [Line Items]
Number of lawsuits | lawsuit	1
Unfunded commitments to purchase investments	$ 449.9	$ 442.0
Operating Segments | Corporate & Other
Loss Contingencies [Line Items]
After-tax costs related to non-core legacy commercial liability policies	$ 15.7

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