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Investments - Net Realized Gains on Sales of Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Fixed Maturities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gains on Sales | $ 2.2 | $ 0.4 | $ 15.0 | $ 1.5
Losses on Sales | (0.3) | (6.0) | (2.6) | (9.3)
Derivative |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gain (Loss) on Hedging Activity | $ 0.0 | $ (8.7) | $ (7.9) | $ (0.3)

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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 -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-9 + 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 -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-9 + Details
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