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Investments - Net Investment Gains (Losses) by Transaction Type (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]
Credit loss impairments	$ 0.0	$ (0.6)	$ (0.5)	$ (2.8)
Intent-to-sell impairments	(0.6)	(6.2)	(6.7)	(7.6)
Total impairments	(0.6)	(6.8)	(7.2)	(10.4)
Sales and other, net	(3.5)	(3.9)	(25.2)	(3.9)
Change in fair value - equity securities	(1.4)	(4.4)	5.3	(34.1)
Change in fair value and gains (losses) realized on settlements - derivatives	(2.9)	2.3	(2.6)	4.6
Net investment losses	$ (8.4)	$ (12.8)	$ (29.7)	$ (43.8)

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Impairments Of Investments

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Other than Temporary Impairment Losses, Investments, Portion Recognized In Earnings, Change In Intent

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Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

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Amount of unrealized and realized gain (loss) on investment in debt and equity securities.

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Amount of writeoff of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of realized gain (loss) on investment.

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