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Investments - Other-Than-Temporary Impairments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other-than-temporary impairment losses, net of recoveries
Net realized capital gains (losses), excluding impairment losses on available-for-sale securities			$ (9.3)
Net other-than-temporary impairment (losses) recoveries on available-for-sale securities			(38.3)
Other-than-temporary impairment losses on fixed maturities, available-for-sale reclassified to (from) other comprehensive income			(5.2)
Net impairment (losses) recoveries on available-for-sale securities			(43.5)
Net realized capital gains (losses)	$ 2.5	$ 302.6	$ (52.8)

X

- Definition

This item represents the net realized and unrealized gains (losses), excluding impairment losses on available-for-sale securities, included in net income for the period as the result of selling or holding invested assets. This item includes the net gain or loss realized from the sale, exchange, redemption or retirement of securities and the unrealized holding gain or loss for certain invested assets. This item excludes other than temporary impairments on available-for-sale debt and equity securities.

+ References

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- Definition

Total other-than-temporary impairment losses on available-for-sale securities reported in the consolidated statement of operations.

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The amount by which the fair value of an investment in securities categorized as available-for-sale is less than or more than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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- Definition

Amount of realized and unrealized gain (loss) on investment.

+ References

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

+ References

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-Publisher FASB
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Amount, before tax, of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in other comprehensive income (OCI).

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