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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Net unrealized investment gains (losses) on fixed maturity securities, net of tax |  |  |  |
Beginning of period |  |  | $ 1,287.5 |
Other comprehensive income (loss) before reclassifications | $ 38.3 | $ 59.3 | 71.6 | $ 88.1
Amounts reclassified from AOCI | 0.4 | 0.4 | 3.5 | 2.9
Other comprehensive income | 38.7 | 59.7 | 75.1 | 91.0
End of period | 1,441.3 | 1,287.0 | 1,441.3 | 1,287.0
Pretax reclassification amounts from accumulated other comprehensive income (loss) | (0.6) | (0.4) | (4.5) | (3.6)
Pretax reclassification amounts from AOCI, tax | (0.1) | (0.1) | (0.9) | (0.8)
Total |  |  |  |
Net unrealized investment gains (losses) on fixed maturity securities, net of tax |  |  |  |
Beginning of period | (217.1) | (282.7) | (253.5) | (314.0)
End of period | (178.4) | (223.0) | (178.4) | (223.0)
Net Unrealized Investment Gains (Losses) on Fixed Maturity Securities |  |  |  |
Net unrealized investment gains (losses) on fixed maturity securities, net of tax |  |  |  |
Beginning of period | (309.9) | (370.4) | (357.4) | (328.3)
Other comprehensive income (loss) before reclassifications | 58.7 | 132.8 | 103.1 | 88.2
Amounts reclassified from AOCI | 0.4 | 0.4 | 3.5 | 2.9
Other comprehensive income | 59.1 | 133.2 | 106.6 | 91.1
End of period | (250.8) | (237.2) | (250.8) | (237.2)
Net Reserve Remeasurements Attributable to Discount Rates |  |  |  |
Net unrealized investment gains (losses) on fixed maturity securities, net of tax |  |  |  |
Beginning of period | 99.8 | 95.3 | 110.9 | 21.9
Other comprehensive income (loss) before reclassifications | (20.4) | (73.5) | (31.5) | (0.1)
Amounts reclassified from AOCI | 0.0 | 0.0 | 0.0 | 0.0
Other comprehensive income | (20.4) | (73.5) | (31.5) | (0.1)
End of period | 79.4 | 21.8 | 79.4 | 21.8
Net Funded Status of Benefit Plans |  |  |  |
Net unrealized investment gains (losses) on fixed maturity securities, net of tax |  |  |  |
Beginning of period | (7.0) | (7.6) | (7.0) | (7.6)
Other comprehensive income (loss) before reclassifications | 0.0 | 0.0 | 0.0 | 0.0
Amounts reclassified from AOCI | 0.0 | 0.0 | 0.0 | 0.0
Other comprehensive income | 0.0 | 0.0 | 0.0 | 0.0
End of period | $ (7.0) | $ (7.6) | $ (7.0) | $ (7.6)

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