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Other Comprehensive Income and Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Stockholders' Equity Attributable to Parent $ 2,671.2   $ 2,671.2     $ 2,505.2    
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax           9.5   $ (37.2)
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax         $ 2.5 2.5   2.8
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax 160.6 $ 241.1 160.6 $ 241.1 272.1   $ 154.4  
AOCI, Gain (Loss), Debt Securities, Available-for-sale, with Allowance for Credit Loss, Parent                
Stockholders' Equity Attributable to Parent (679.6) (637.6) (679.6) (637.6) (617.2) (530.9) (572.0) (719.4)
OCI, before Reclassifications, Net of Tax, Attributable to Parent (61.4) (72.1) (157.5) 75.4        
Reclassification from AOCI, Current Period, Tax 0.3 (1.8) (2.3) (1.8)        
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent (1.0) 6.5 8.8 6.4        
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 16.8 19.4 39.5 (20.4)        
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (62.4) (65.6) (148.7) 81.8        
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]                
Stockholders' Equity Attributable to Parent (3.7) (2.3) (3.7) (2.3) (1.1) (2.5) (2.2) (2.2)
OCI, before Reclassifications, Net of Tax, Attributable to Parent (2.3) 0.0 (0.7) 1.4        
Reclassification from AOCI, Current Period, Tax 0.0 0.0 0.2 0.4        
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent (0.3) (0.1) (0.5) (1.5)        
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 0.4 0.0 0.5 (0.4)        
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (2.6) (0.1) (1.2) (0.1)        
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]                
Stockholders' Equity Attributable to Parent 8.3 (38.0) 8.3 (38.0)     37.6  
OCI, before Reclassifications, Net of Tax, Attributable to Parent 0.0 0.0 0.0 0.0        
Reclassification from AOCI, Current Period, Tax 0.4 0.4 0.5 0.3        
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent (0.4) (0.4) (1.2) (0.8)        
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 0.4 0.0 0.5 0.0        
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (0.4) (0.4) (1.2) (0.8)        
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax         8.7      
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]                
Stockholders' Equity Attributable to Parent (0.3) 2.7 (0.3) 2.7     2.7  
OCI, before Reclassifications, Net of Tax, Attributable to Parent (2.8) 0.0 (2.8) 0.0        
Reclassification from AOCI, Current Period, Tax 0.0 (0.1) 0.0 0.0        
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent 0.0 0.0 0.0 (0.1)        
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 0.8 0.0 0.8 0.0        
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (2.8) 0.0 (2.8) (0.1)        
AOCI, Liability for Future Policy Benefit, Parent                
Stockholders' Equity Attributable to Parent 358.0 194.4 358.0 194.4        
OCI, before Reclassifications, Net of Tax, Attributable to Parent 85.9 40.0 197.4 (46.7)        
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 (22.9) (10.6) (52.5) 12.5        
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 85.9 40.0 197.4 (46.7)        
AOCI Attributable to Parent [Member]                
Stockholders' Equity Attributable to Parent (317.3) (480.8) (317.3) (480.8) $ (335.0) $ (360.8) $ (454.7) $ (514.9)
OCI, before Reclassifications, Net of Tax, Attributable to Parent 19.4 (32.1) 36.4 30.1        
Reclassification from AOCI, Current Period, Tax 0.7 (1.5) (1.6) (1.1)        
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent (1.7) 6.0 7.1 4.0        
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent (4.5) 8.8 (11.2) (8.3)        
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent $ 17.7 $ (26.1) $ 43.5 $ 34.1