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Investments Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Net Investment Income [Line Items] |  |
Investment Income, Equity Method Limited Liability Investments | $ (3.6) | $ 7.1
Investment Income, Limited Liability Investments Included in Equity Securities | 2.6 | 3.9
Investment Income, Alternative Investments | (1.0) | 11.0
Investment Income, Real Estate | 2.5 | 2.4
Gross Investment Income | 87.5 | 84.0
Investment Income, Investment Expense | 4.8 | 4.8
Net Investment Income | 82.7 | 79.2
Fixed Maturities: |  |
Net Investment Income [Line Items] |  |
Interest and Dividend Income, Operating | 76.4 | 62.4
Equity Securities [Member] |  |
Net Investment Income [Line Items] |  |
Interest and Dividend Income, Operating | 2.5 | 1.9
Short-term Investments [Member] |  |
Net Investment Income [Line Items] |  |
Interest and Dividend Income, Operating | 1.8 | 0.8
Policy Loans [Member] |  |
Net Investment Income [Line Items] |  |
Interest and Dividend Income, Operating | 5.3 | 5.5
Real Estate Investment [Member] |  |
Net Investment Income [Line Items] |  |
Investment Income, Investment Expense | 2.4 | 2.3
Other Investment [Member] |  |
Net Investment Income [Line Items] |  |
Investment Income, Investment Expense | $ 2.4 | $ 2.5

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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://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) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 + Details
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