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Investment Securities (Net Investment Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Equity in earnings of unconsolidated affiliates, net of tax | $ 0.0 | $ 3.9 | $ 0.0 | $ 18.0
Investment income |  |  |  |
Total investment income | 22.9 | 17.1 | 61.4 | 47.2
Third-party investment expenses | (0.4) | (0.3) | (1.8) | (4.6)
Net investment income, pre-tax | 22.5 | 16.8 | 59.6 | 42.6
Fixed maturity investments. |  |  |  |
Investment income |  |  |  |
Total investment income | 21.3 | 13.7 | 53.7 | 38.5
Short-term investments |  |  |  |
Investment income |  |  |  |
Total investment income | 0.2 | 0.0 | 0.8 | 0.1
Common Stock |  |  |  |
Investment income |  |  |  |
Total investment income | 1.3 | 1.4 | 3.4 | 5.7
Other long-term investments |  |  |  |
Investment income |  |  |  |
Total investment income | $ 0.1 | $ 2.0 | $ 3.5 | $ 2.9

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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1-5) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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