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Investments Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Net Investment Income [Line Items] |  |  |  |
Investment Income, Equity Method Limited Liability Investments | $ 11.1 | $ 5.2 | $ 21.9 | $ 3.7
Investment Income, Fair Value Option Investments | 0.5 | (1.4) | 1.0 | (3.9)
Investment Income, Limited Liability Investments Included in Equity Securities | 5.9 | 5.7 | 18.7 | 16.6
Investment Income, Alternative Investments | 17.5 | 9.5 | 41.6 | 16.4
Investment Income, Real Estate | 2.6 | 3.0 | 8.3 | 8.9
Gross Investment Income | 90.0 | 82.2 | 257.8 | 232.0
Investment Income, Investment Expense | 4.1 | 4.5 | 13.2 | 13.6
Net Investment Income | 85.9 | 77.7 | 244.6 | 218.4
Fixed Maturities [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Interest and Dividend Income, Operating | 61.8 | 61.4 | 184.0 | 181.2
Equity Securities [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Interest and Dividend Income, Operating | 2.6 | 2.7 | 7.0 | 9.0
Short-term Investments [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Interest and Dividend Income, Operating | 0.5 | 0.2 | 1.0 | 0.4
Policy Loans [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Interest and Dividend Income, Operating | 4.9 | 5.4 | 15.7 | 16.1
Other Investment [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Interest and Dividend Income, Operating | 0.1 | 0.0 | 0.2 | 0.0
Real Estate Investment [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment Income, Investment Expense | 2.6 | 2.9 | 7.7 | 8.4
Other Investment [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment Income, Investment Expense | $ 1.5 | $ 1.6 | $ 5.5 | $ 5.2

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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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