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Investments - Net Realized Capital Gains and Losses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Major components of net realized capital gains (losses) on investments
Fixed maturities, available-for-sale: Gross gains	$ 64.4	$ 134.2	$ 15.5
Fixed maturities, available-for-sale: Gross losses	(29.2)	(48.5)	(15.3)
Fixed maturities, available-for-sale: Net credit recoveries (losses)	(45.0)	(22.9)
Fixed maturities, available-for-sale: Net credit recoveries (losses)			(43.5)
Fixed maturities, available-for-sale: Hedging, net	(9.5)	(9.7)	(9.3)
Fixed maturities, trading	(33.3)	3.2	43.0
Equity securities	100.0	70.5	84.5
Mortgage loans gains (losses)	6.5	(15.5)	3.0
Derivative net realized capital gains (losses)	(116.9)	77.3	(120.3)
Other gains (losses)	65.5	114.0	(10.4)
Net realized capital gains (losses)	2.5	302.6	(52.8)
Unrealized gains (losses) on fixed maturities, trading	(32.2)	5.3	32.8
Unrealized gains (losses) on equity securities	58.6	64.6	61.6
Unrealized gains (losses) on equity securities reported in net investment income	28.7	35.2	66.9
Proceeds from sales of investments
Proceeds from sales of investments in fixed maturities, available-for-sale	$ 2,110.9	$ 2,421.9	$ 1,654.8

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Amount of net credit losses includes adjustments to the credit loss valuation allowance, write offs and recoveries on available-for-sale securities.

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Amount of gain (loss) included in earnings on loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

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Net realized capital gains (losses) including periodic settlements and mark-to-market adjustments on derivative instruments not designated as hedges.

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

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Amount of realized gain 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 realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), excluding other-than-temporary impairment (OTTI).

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