Investments - Net Realized Gain (Loss) on Investments (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Realized gains on fixed maturity securities	$ 3.7	$ 0.8
Realized losses on fixed maturity securities	(0.6)	(1.7)
Realized gains on equity securities	0.0	0.1
Realized losses on equity securities	0.0	(0.9)
Realized gains on mortgage loans	0.1	0.0
Net unrealized gains (losses) on equity securities	(21.7)	7.4
Net unrealized gains (losses) on derivative instruments	0.2	(0.2)
Impairment loss	(0.8)	0.0
Net realized and unrealized gains (losses)	$ (19.1)	$ 5.5

Equity Securities, FV-NI, Impairment Loss

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- Definition

Equity Securities, FV-NI, Realized Gains On Mortgage Loans

+ References

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(9)(a))
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-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27357-111563

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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).

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Amount of realized gain from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of realized loss from sale of 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 unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
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-Paragraph 4
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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

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