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Investments Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Net Investment Income [Line Items] |  |
Investment Income, Equity Method Limited Liability Investments | $ 7.1 | $ 6.8
Investment Income, Fair Value Option Investments | 0.0 | 1.1
Investment Income, Limited Liability Investments Included in Equity Securities | 3.9 | 7.4
Investment Income, Alternative Investments | 11.0 | 15.3
Investment Income, Real Estate | 2.4 | 2.9
Gross Investment Income | 84.0 | 86.2
Investment Income, Investment Expense | 4.8 | 4.6
Net Investment Income | 79.2 | 81.6
Fixed Maturities [Member] |  |
Net Investment Income [Line Items] |  |
Interest and Dividend Income, Operating | 62.4 | 60.1
Equity Securities [Member] |  |
Net Investment Income [Line Items] |  |
Interest and Dividend Income, Operating | 1.9 | 2.1
Short-term Investments [Member] |  |
Net Investment Income [Line Items] |  |
Interest and Dividend Income, Operating | 0.8 | 0.3
Policy Loans [Member] |  |
Net Investment Income [Line Items] |  |
Interest and Dividend Income, Operating | 5.5 | 5.5
Real Estate Investment [Member] |  |
Net Investment Income [Line Items] |  |
Investment Income, Investment Expense | 2.3 | 2.6
Other Investment [Member] |  |
Net Investment Income [Line Items] |  |
Investment Income, Investment Expense | $ 2.5 | $ 2.0

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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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