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Accumulated Other Comprehensive Income (Loss) (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  
Other comprehensive income (loss) before reclassifications $ (53.0) $ (112.7) (26.7) $ (395.8)
Amounts reclassified from AOCI 2.7 8.4 16.2 12.6
Other comprehensive loss (50.3) (104.3) (10.5) (383.2)
Ending balance 1,051.3 1,092.3 1,051.3 1,092.3
Pretax reclassification amounts from AOCI, tax (0.7) (2.3) (4.3) (3.4)
AOCI        
Net unrealized investment gains (losses) on fixed maturity securities, net of tax        
Beginning balance (359.6) (328.9) (399.4) (50.0)
Ending balance (409.9) (433.2) (409.9) (433.2)
Net Unrealized Investment Gains (Losses) on 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
Other comprehensive income (loss) before reclassifications (143.7) (223.4) (101.3) (856.5)
Amounts reclassified from AOCI 2.7 8.4 16.2 12.6
Other comprehensive loss (141.0) (215.0) (85.1) (843.9)
Ending balance (534.7) (496.8) (534.7) (496.8)
Pretax reclassification amounts from accumulated other comprehensive income (loss) (3.5) (10.7) (20.5) (15.9)
Net Reserve Remeasurements Attributable to Discount Rates        
Net unrealized investment gains (losses) on fixed maturity securities, net of tax        
Beginning balance 42.9 (36.9) 59.0 (386.9)
Other comprehensive income (loss) before reclassifications 90.7 110.7 74.6 460.7
Amounts reclassified from AOCI 0.0 0.0 0.0 0.0
Other comprehensive loss 90.7 110.7 74.6 460.7
Ending balance 133.6 73.8 133.6 73.8
Net Funded Status of Benefit Plans        
Net unrealized investment gains (losses) on fixed maturity securities, net of tax        
Beginning balance (8.8) (10.2) (8.8) (10.2)
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 loss 0.0 0.0 0.0 0.0
Ending balance $ (8.8) $ (10.2) $ (8.8) $ (10.2)