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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Investment [Line Items] |  |  |  |
Gross investment income | $ 50.5 | $ 19.4 | $ 101.9 | $ 37.2
External investment expense | (0.2) | 0.0 | (0.5) | (0.1)
Net investment income | 50.3 | 19.4 | 101.4 | 37.1
Fixed maturity securities, available-for-sale at fair value |  |  |  |
Investment [Line Items] |  |  |  |
Gross investment income | 43.7 | 16.2 | 87.3 | 31.9
Equity securities |  |  |  |
Investment [Line Items] |  |  |  |
Gross investment income | 2.1 | 0.7 | 4.6 | 1.3
Mortgage loans |  |  |  |
Investment [Line Items] |  |  |  |
Gross investment income | 3.1 | 1.6 | 6.8 | 2.8
Policy loans |  |  |  |
Investment [Line Items] |  |  |  |
Gross investment income | 0.2 | 0.3 | 0.6 | 0.6
Other invested assets |  |  |  |
Investment [Line Items] |  |  |  |
Gross investment income | $ 1.4 | $ 0.6 | $ 2.6 | $ 0.6

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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, 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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