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Investments - Net Realized Capital Gains and Losses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Major components of net realized capital gains (losses) on investments
Fixed maturities, available-for-sale: Gross gains	$ 22.3	$ 3.0	$ 128.6	$ 11.7
Fixed maturities, available-for-sale: Gross losses	(12.8)	(1.3)	(38.6)	(10.7)
Fixed maturities, available-for-sale: Net credit loss	(9.1)		(25.3)
Fixed maturities, available-for-sale: Net credit loss		(11.1)		(35.2)
Fixed maturities, available-for-sale: Hedging, net	(0.2)		(9.8)	(9.3)
Fixed maturities, trading	(1.5)	18.1	7.2	49.8
Equity securities	52.8	33.2	28.4	68.9
Mortgage loans gains (losses)	(0.3)	(0.1)	(15.3)	0.5
Derivative net realized capital gains (losses)	(42.5)	(11.7)	52.3	(2.1)
Other gains (losses)	56.8	(72.5)	42.0	(35.5)
Net realized capital gains (losses)	65.5	(42.4)	169.5	38.1
Unrealized gains (losses) on fixed maturities, trading	(1.5)	17.9	8.7	49.7
Unrealized gains (losses) on equity securities	48.0	24.7	30.0	55.1
Unrealized gains (losses) on equity securities reported in net investment income	2.7	21.1	13.2	62.3
Proceeds from sales of investments
Proceeds from sales of investments in fixed maturities, available-for-sale	$ 628.6	$ 176.1	$ 2,176.2	$ 1,367.1

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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 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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