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Investments - Reconciliation of Net Unrealized Investment Gains (Losses) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Net unrealized investment gains (losses) on fixed maturity securities, net of tax |  |  |  |
Beginning balance |  |  | $ 1,098.3 |
Ending balance | $ 1,051.3 | $ 1,092.3 | 1,051.3 | $ 1,092.3
Net unrealized investment gains (losses) on securities |  |  |  |
Net unrealized investment gains (losses) on fixed maturity securities, net of tax |  |  |  |
Beginning balance | (393.7) | (281.8) | (449.6) | 347.1
Ending balance | (534.7) | (496.8) | (534.7) | (496.8)
Net unrealized investment gains (losses) on securities | Fixed maturity securities |  |  |  |
Net unrealized investment gains (losses) on fixed maturity securities, net of tax |  |  |  |
Beginning balance | (393.7) | (281.8) | (449.6) | 347.1
Change in net unrealized investment gains (losses) on fixed maturity securities | (143.7) | (223.4) | (101.3) | (856.5)
Reclassification of net investment losses on fixed maturity securities to net income | 2.7 | 8.4 | 16.2 | 12.6
Ending balance | $ (534.7) | $ (496.8) | $ (534.7) | $ (496.8)

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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 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 2: 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 3: 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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