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Investments - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Schedule of Investments [Line Items]
Investment grade rating	97.80%
Reverse repurchase agreement, cash to value percentage	95.00%
Securities sold under agreements to repurchase	$ 0.0	$ 12.0
Fair Value	5,666.5	5,387.9
FHLB funding agreements	1,039.5	989.5
FHLB of Chicago
Schedule of Investments [Line Items]
Fair Value	1,109.5	1,072.2
Governmental Agencies as Required by Law in Various States
Schedule of Investments [Line Items]
Fair Value	25.9	27.1
Fair Value
Schedule of Investments [Line Items]
Securities sold under agreements to repurchase	$ 0.0	$ 12.4

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