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Investments Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Net Investment Income [Line Items] |  |  |  |  |
Investment Income, Equity Method Limited Liability Investments | $ (0.4) | $ 11.1 |  | $ 8.1 | $ 21.9
Investment Income, Fair Value Option Investments | 0.0 | 0.5 |  | 0.0 | 1.0
Investment Income, Limited Liability Investments Included in Equity Securities | 13.7 | 5.9 |  | 22.8 | 18.7
Investment Income, Alternative Investments | 13.3 | 17.5 |  | 30.9 | 41.6
Investment Income, Real Estate | 2.4 | 2.6 |  | 7.2 | 8.3
Gross Investment Income | 96.8 | 90.0 |  | 263.9 | 257.8
Investment Income, Investment Expense | 4.8 | 4.1 |  | 14.3 | 13.2
Net Investment Income | 92.0 | 85.9 |  | 249.6 | 244.6
Fixed Maturities: |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Interest and Dividend Income, Operating | 70.6 | 61.8 |  | 197.4 | 184.0
Equity Securities [Member] |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Interest and Dividend Income, Operating | 2.5 | 2.6 |  | 7.0 | 7.0
Short-term Investments [Member] |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Interest and Dividend Income, Operating | 2.3 | 0.5 |  | 4.3 | 1.0
Policy Loans [Member] |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Interest and Dividend Income, Operating | 5.5 | 4.9 |  | 16.5 | 15.7
Other Investment [Member] |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Interest and Dividend Income, Operating | 0.2 | 0.1 | $ 0.2 | 0.6 |
Real Estate Investment [Member] |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Investment Income, Investment Expense | 2.6 | 2.6 |  | 7.5 | 7.7
Other Investment [Member] |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Investment Income, Investment Expense | $ 2.2 | $ 1.5 |  | $ 6.8 | $ 5.5

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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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