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Investments - Net Realized Capital Gains and Losses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Major components of net realized capital gains (losses) on investments
Fixed maturities, available-for-sale: Gross gains	$ 23.1	$ 2.5
Fixed maturities, available-for-sale: Gross losses	(4.2)	(1.5)
Fixed maturities, available-for-sale: Net credit loss	(7.9)
Fixed maturities, available-for-sale: Net credit loss		(6.8)
Fixed maturities, available-for-sale: Hedging, net	(1.5)
Fixed maturities, trading	(16.4)	14.2
Equity securities	(63.7)	21.0
Net realized capital gains (losses)	131.4	84.5
Unrealized gains (losses) on fixed maturities, trading	(14.2)	14.2
Unrealized gains (losses) on equity securities	(66.0)	19.8
Unrealized gains (losses) on equity securities reported in net investment income	(38.5)	22.5
Proceeds from sales of investments
Proceeds from sales of investments in fixed maturities, available-for-sale	541.6	163.0
Mortgage loans
Major components of net realized capital gains (losses) on investments
Realized capital gains (losses)	(15.7)	0.3
Derivatives
Major components of net realized capital gains (losses) on investments
Realized capital gains (losses)	290.5	5.0
Other investment types
Major components of net realized capital gains (losses) on investments
Realized capital gains (losses)	$ (72.8)	$ 49.8

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

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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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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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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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