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Other Comprehensive Income and Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Equity, Attributable to Parent, Beginning Balance $ 370.0   $ 2,788.4  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 30.7 $ 64.8 77.7 $ 108.3
Equity, Attributable to Parent, Ending Balance 2,732.1   2,732.1  
Net Unrealized Losses on Fixed Maturities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Equity, Attributable to Parent, Beginning Balance (631.7) (679.6) (687.8) (530.9)
Other Comprehensive Income (Loss) Before Reclassifications 84.7 226.4 140.7 68.9
Reclassification from AOCI, Current Period, Tax 0.2 0.0 0.2 2.3
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent 0.7 0.1 0.8 8.9
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 22.4 60.1 37.3 (20.6)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 85.4 226.5 141.5 77.8
Equity, Attributable to Parent, Ending Balance (546.3) (453.1) (546.3) (453.1)
Net Unrealized Losses on Investments with an Allowance for Credit Losses        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Equity, Attributable to Parent, Beginning Balance (2.2) (3.7) (3.2) (2.5)
Other Comprehensive Income (Loss) Before Reclassifications (5.1) 0.2 (0.3) (0.5)
Reclassification from AOCI, Current Period, Tax 1.2 0.0 0.2 (0.2)
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent 4.3 0.0 0.5 (0.5)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent (0.2) (0.2) 0.1 0.7
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (0.8) 0.2 0.2 (1.0)
Equity, Attributable to Parent, Ending Balance (3.0) (3.5) (3.0) (3.5)
Net Unrecognized Postretirement Benefit Income        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Equity, Attributable to Parent, Beginning Balance 7.6 8.3 8.4 9.5
Other Comprehensive Income (Loss) Before Reclassifications 0.0 0.0 0.0 0.0
Reclassification from AOCI, Current Period, Tax 0.0 (0.1) (0.3) (0.6)
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent (0.5) (0.6) (1.3) (1.8)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 0.0 (0.1) (0.3) 0.6
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (0.5) (0.6) (1.3) (1.8)
Equity, Attributable to Parent, Ending Balance 7.1 7.7 7.1 7.7
Net Loss on Cash Flow Hedges        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Equity, Attributable to Parent, Beginning Balance (1.4) (0.3) (2.2) 2.5
Other Comprehensive Income (Loss) Before Reclassifications 0.6 3.5 1.4 0.7
Reclassification from AOCI, Current Period, Tax 0.0 0.1 0.0 0.1
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent (0.1) 0.4 (0.1) 0.4
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 0.2 1.0 (0.2) (0.2)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 0.5 3.9 1.3 1.1
Equity, Attributable to Parent, Ending Balance (0.9) 3.6 (0.9) 3.6
Change in Discount Rate on Future Life Policyholder Benefits        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Equity, Attributable to Parent, Beginning Balance   358.0 380.3 160.6
Other Comprehensive Income (Loss) Before Reclassifications (54.0) (165.2) (64.3) 32.2
Reclassification from AOCI, Current Period, Tax 0.0 0.0 0.0 0.0
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent 0.0 0.0 0.0 0.0
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent (14.4) (43.9) (17.1) (8.6)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (54.0) (165.2) (64.3) 32.2
Equity, Attributable to Parent, Ending Balance 316.0 192.8 316.0 192.8
Accumulated Other Comprehensive (Loss) Income        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Equity, Attributable to Parent, Beginning Balance (257.7) (317.3) (304.5) (360.8)
Other Comprehensive Income (Loss) Before Reclassifications 26.2 64.9 77.5 101.3
Reclassification from AOCI, Current Period, Tax 1.4 0.0 0.1 1.6
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent 4.4 (0.1) (0.1) 7.0
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 8.0 16.9 19.8 (28.1)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 30.6 64.8 77.4 108.3
Equity, Attributable to Parent, Ending Balance $ (227.1) $ (252.5) $ (227.1) $ (252.5)