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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Net Investment Income [Line Items] |  |  |  |
Investment income | $ 96.9 | $ 96.8 | $ 285.4 | $ 263.9
Investment expenses | 5.2 | 4.8 | 15.0 | 14.3
Net investment income | 91.7 | 92.0 | 270.4 | 249.6
Fixed Maturities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income | 73.5 | 70.6 | 225.5 | 197.4
Equity Securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income | 5.2 | 2.5 | 14.6 | 7.0
Total Alternative Investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income | 6.8 | 13.3 | 13.5 | 30.9
Equity Method Limited Liability Investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income | 1.6 | (0.4) | 0.6 | 8.1
Limited Liability Investments Included in Equity Securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income | 5.2 | 13.7 | 12.9 | 22.8
Short-term Investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income | 2.5 | 2.3 | 6.9 | 4.3
Loans to Policyholders |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income | 5.9 | 5.5 | 16.9 | 16.5
Real Estate |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income | 2.4 | 2.4 | 7.1 | 7.2
Investment expenses | 2.5 | 2.6 | 7.2 | 7.5
Other |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income | 0.6 | 0.2 | 0.9 | 0.6
Investment expenses | $ 2.7 | $ 2.2 | $ 7.8 | $ 6.8

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- Definition Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 + Details
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- Definition Amount of expenses related to the generation of investment income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 + Details
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- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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