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Investments - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Investment grade rating	96.80%
Reverse repurchase agreement, cash to value percentage	95.00%
Securities sold under agreements to repurchase	$ 0.2	$ 70.2
Fair Value	4,961.6	5,185.0
FHLB funding agreements	904.5	792.5
FHLB of Chicago
Schedule of Investments [Line Items]
Fair Value	971.0	860.4
Governmental Agencies as Required by Law in Various States
Schedule of Investments [Line Items]
Fair Value	28.6	28.6
Fair Value
Schedule of Investments [Line Items]
Securities sold under agreements to repurchase	$ 0.4	$ 73.3

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