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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, 2023 | Mar. 31, 2022
Net unrealized investment gains (losses) on fixed maturity securities, net of tax |  |
Beginning balance | $ 1,098.3 |
Ending balance | 1,139.2 | $ 1,351.5
Net unrealized investment gains (losses) on securities |  |
Net unrealized investment gains (losses) on fixed maturity securities, net of tax |  |
Beginning balance | (449.6) | 347.1
Ending balance | (356.4) | 13.0
Net unrealized investment gains (losses) on securities | Fixed maturity securities |  |
Net unrealized investment gains (losses) on fixed maturity securities, net of tax |  |
Beginning balance | (449.6) | 347.1
Change in net unrealized investment gains (losses) on fixed maturity securities | 91.3 | (335.9)
Reclassification of net investment losses on fixed maturity securities to net income | 1.9 | 1.8
Ending balance | $ (356.4) | $ 13.0

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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 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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