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Investments - Net Realized Gains on Sales of Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Net Investment Income [Line Items] |  |  |  |
Gain (Loss) on Hedging Activity | $ (0.3) | $ 0.0 | $ 0.0 | $ 0.0
Fixed Maturities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gains on Sales | 14.2 | 10.3 | 28.0 | 42.7
Losses on Sales | (23.9) | (0.4) | (27.5) | (1.7)
Derivative |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gain (Loss) on Hedging Activity | $ (0.3) | $ 0.0 | $ 0.0 | $ 0.0

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- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27357-111563 + Details
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- Definition Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27357-111563 + Details
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- Definition Gain (loss) incurred in hedging activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
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