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Investments - Net Realized Gain (Loss) on Investments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Realized gains on fixed maturity securities	$ 4.2	$ 2.4	$ 5.1	$ 3.7
Realized losses on fixed maturity securities	(3.3)	(0.6)	(5.1)	(1.3)
Realized gains on equity securities	0.3	0.0	0.4	0.0
Realized losses on equity securities	(0.2)	0.0	(1.1)	0.0
Net unrealized gains (losses) on equity securities	(1.6)	0.5	5.8	(0.2)
Net unrealized gains (losses) on derivative instruments	(0.9)	0.2	(1.1)	0.8
Net realized and unrealized gains (losses)	$ (1.5)	$ 2.5	$ 4.0	$ 3.0

X

- Definition

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

+ References

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-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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- Definition

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

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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).

+ References

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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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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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+ References

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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.

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