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Investments - Reconciliation of Net Unrealized Investment Gains (Losses) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Net unrealized investment gains (losses) on fixed maturity securities, net of tax |  |
Beginning of period | $ 1,287.5 |
End of period | 1,342.8 | $ 1,211.4
Net unrealized investment gains (losses) on securities |  |
Net unrealized investment gains (losses) on fixed maturity securities, net of tax |  |
Beginning of period | (357.4) | (328.3)
End of period | (314.5) | (348.0)
Net unrealized investment gains (losses) on securities | Fixed maturity securities |  |
Net unrealized investment gains (losses) on fixed maturity securities, net of tax |  |
Beginning of period | (357.4) | (328.3)
Change in net unrealized investment gains (losses) on fixed maturity securities | 43.0 | (20.5)
Reclassification of net investment losses on fixed maturity securities to net income | (0.1) | 0.8
End of period | $ (314.5) | $ (348.0)

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- Definition Amount, after tax and adjustment, of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-11 + Details
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