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Investments - Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Investment [Line Items]
Gross investment income	$ 50.5	$ 19.4	$ 101.9	$ 37.2
External investment expense	(0.2)	0.0	(0.5)	(0.1)
Net investment income	50.3	19.4	101.4	37.1
Fixed maturity securities, available-for-sale at fair value
Investment [Line Items]
Gross investment income	43.7	16.2	87.3	31.9
Equity securities
Investment [Line Items]
Gross investment income	2.1	0.7	4.6	1.3
Mortgage loans
Investment [Line Items]
Gross investment income	3.1	1.6	6.8	2.8
Policy loans
Investment [Line Items]
Gross investment income	0.2	0.3	0.6	0.6
Other invested assets
Investment [Line Items]
Gross investment income	$ 1.4	$ 0.6	$ 2.6	$ 0.6

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- Definition

Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.2)
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Amount of expenses related to the generation of investment income.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
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Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

+ References

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