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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Net unrealized investment gains (losses) on fixed maturity securities, net of tax |  |
Beginning balance | $ 1,175.3 |
Other comprehensive income (loss) before reclassifications | 20.9 | $ 50.1
Amounts reclassified from AOCI | 0.8 | 1.9
Other comprehensive income | 21.7 | 52.0
Ending balance | 1,211.4 | 1,139.2
Pretax reclassification amounts from AOCI, tax | (0.2) | (0.5)
Total |  |
Net unrealized investment gains (losses) on fixed maturity securities, net of tax |  |
Beginning balance | (314.0) | (399.4)
Ending balance | (292.3) | (347.4)
Net Unrealized Investment Gains (Losses) on Fixed Maturity Securities |  |
Net unrealized investment gains (losses) on fixed maturity securities, net of tax |  |
Beginning balance | (328.3) | (449.6)
Other comprehensive income (loss) before reclassifications | (20.5) | 91.3
Amounts reclassified from AOCI | 0.8 | 1.9
Other comprehensive income | (19.7) | 93.2
Ending balance | (348.0) | (356.4)
Pretax reclassification amounts from accumulated other comprehensive income (loss) | (1.0) | (2.4)
Net Reserve Remeasurements Attributable to Discount Rates |  |
Net unrealized investment gains (losses) on fixed maturity securities, net of tax |  |
Beginning balance | 21.9 | 59.0
Other comprehensive income (loss) before reclassifications | 41.4 | (41.2)
Amounts reclassified from AOCI | 0.0 | 0.0
Other comprehensive income | 41.4 | (41.2)
Ending balance | 63.3 | 17.8
Net Funded Status of Benefit Plans |  |
Net unrealized investment gains (losses) on fixed maturity securities, net of tax |  |
Beginning balance | (7.6) | (8.8)
Other comprehensive income (loss) before reclassifications | 0.0 | 0.0
Amounts reclassified from AOCI | 0.0 | 0.0
Other comprehensive income | 0.0 | 0.0
Ending balance | $ (7.6) | $ (8.8)

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