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Income from Investments - Net Impairment Losses Recognized in Earnings (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Net Investment Income [Line Items] |  |  |
Total Other-than-temporary Impairment Losses | $ (11.0) | $ (19.5) | $ (13.8)
Fixed Maturities: |  |  |
Net Investment Income [Line Items] |  |  |
Total Other-than-temporary Impairment Losses | (6.4) | (16.7) | (13.3)
Equity Securities |  |  |
Net Investment Income [Line Items] |  |  |
Total Other-than-temporary Impairment Losses | (4.2) | $ (2.8) | $ (0.5)
Real Estate |  |  |
Net Investment Income [Line Items] |  |  |
Total Other-than-temporary Impairment Losses | $ (0.4) |  |

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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=124260329&loc=SL6284422-111562 + 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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