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Investment Securities (Net Investment Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Investment income
Total investment income	$ 13.9	$ 12.9	$ 46.7	$ 41.7
Third-party investment expenses	(0.5)	(0.7)	(1.8)	(2.0)
Net investment income, pre-tax	13.4	12.2	44.9	39.7
Fixed maturity investments
Investment income
Total investment income	7.5	9.8	27.3	32.9
Short-term investments
Investment income
Total investment income	1.8	0.3	6.5	0.6
Common Stock
Investment income
Total investment income	3.4	2.7	11.2	7.7
Other long-term investments
Investment income
Total investment income	$ 1.2	$ 0.1	$ 1.7	$ 0.5

X

- Definition

Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.1-5)
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Amount of expenses related to the generation of investment income.

+ 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
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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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