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Investments - Net Realized Gains on Sales of Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Net Investment Income [Line Items] |  |  |  |
Net Realized Investment Gains | $ 3.9 | $ 1.1 | $ 4.7 | $ 9.2
Fixed Maturities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Debt Securities, Available-for-Sale, Realized Gain | 3.7 | 0.9 | 5.4 | 15.9
Debt Securities, Available-for-Sale, Realized Loss | (0.5) | 0.0 | (1.5) | (2.6)
Derivative |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gain (Loss) on Hedging Activity | 0.0 | 0.0 | 0.0 | (7.9)
Equity Securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Debt Securities, Available-for-Sale, Realized Gain | 0.5 | 0.0 | 0.5 | 4.1
Debt Securities, Available-for-Sale, Realized Loss | 0.0 | 0.0 | 0.0 | (0.1)
Other Investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Debt Securities, Available-for-Sale, Realized Gain | 0.2 | 1.8 | 0.3 | 3.3
Debt Securities, Available-for-Sale, Realized Loss | $ 0.0 | $ (1.6) | $ 0.0 | $ (3.5)

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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 gain (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/2009/role/commonPracticeRef -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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