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Investments Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Net Investment Income [Line Items] |  |  |  |  |  |
Investment Income, Equity Method Limited Liability Investments | $ 1.4 |  | $ 4.0 |  | $ 8.5 | $ 10.8
Investment Income, Fair Value Option Investments | 0.0 |  | (0.6) |  | 0.0 | 0.5
Investment Income, Limited Liability Investments Included in Equity Securities | 5.2 |  | 5.4 |  | 9.1 | 12.8
Investment Income, Alternative Investments | 6.6 |  | 8.8 |  | 17.6 | 24.1
Investment Income, Real Estate | 2.4 |  | 2.8 |  | 4.8 | 5.7
Gross Investment Income | 83.1 |  | 81.6 |  | 167.1 | 167.8
Investment Income, Investment Expense | 4.7 |  | 4.5 |  | 9.5 | 9.1
Net Investment Income | 78.4 |  | 77.1 |  | 157.6 | 158.7
Fixed Maturities: |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |
Interest and Dividend Income, Operating | 64.4 |  | 62.1 |  | 126.8 | 122.2
Equity Securities [Member] |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |
Interest and Dividend Income, Operating | 2.6 |  | 2.3 |  | 4.5 | 4.4
Short-term Investments [Member] |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |
Interest and Dividend Income, Operating | 1.2 |  | 0.2 |  | 2.0 | 0.5
Policy Loans [Member] |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |
Interest and Dividend Income, Operating | 5.5 |  | 5.3 |  | 11.0 | 10.8
Other Investment [Member] |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |
Interest and Dividend Income, Operating | 0.4 | $ 0.1 |  | $ 0.1 | 0.4 |
Real Estate Investment [Member] |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |
Investment Income, Investment Expense | 2.6 |  | 2.5 |  | 4.9 | 5.1
Other Investment [Member] |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |
Investment Income, Investment Expense | $ 2.1 |  | $ 2.0 |  | $ 4.6 | $ 4.0

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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://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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