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Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Stockholders' Equity Attributable to Parent $ 2,646.9   $ 2,670.6  
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax     (37.2) $ (52.1)
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax     2.8 (1.9)
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax 241.1 $ (849.7)    
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]        
Stockholders' Equity Attributable to Parent (2.2) (9.5) (2.2) (3.7)
OCI, before Reclassifications, Net of Tax, Attributable to Parent 1.4 (5.8)    
Reclassification from AOCI, Current Period, Tax   0.0    
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent (1.4) 0.0    
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent (0.4) 1.6    
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 0.0 (5.8)    
Accumulated Other Comprehensive Loss        
Stockholders' Equity Attributable to Parent (454.7) (467.8) (514.9) (401.6)
OCI, before Reclassifications, Net of Tax, Attributable to Parent 62.2 (72.0)    
Reclassification from AOCI, Current Period, Tax 0.4 (1.5)    
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent (2.0) 5.8    
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent (17.1) 17.5    
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 60.2 (66.2)    
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Stockholders' Equity Attributable to Parent (37.6) (52.1)    
OCI, before Reclassifications, Net of Tax, Attributable to Parent 0.0 0.0    
Reclassification from AOCI, Current Period, Tax (0.1) 0.0    
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent (0.4) 0.0    
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 0.0 0.0    
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (0.4) 0.0    
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]        
Stockholders' Equity Attributable to Parent 2.7 2.8    
OCI, before Reclassifications, Net of Tax, Attributable to Parent 0.0 4.7    
Reclassification from AOCI, Current Period, Tax 0.1 0.0    
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent (0.1) 0.0    
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 0.0 (1.2)    
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (0.1) 4.7    
AOCI, Gain (Loss), Debt Securities, Available-for-sale, with Allowance for Credit Loss, Parent        
Stockholders' Equity Attributable to Parent (572.0) (3.5) $ (719.4) $ 505.8
OCI, before Reclassifications, Net of Tax, Attributable to Parent 147.5 (515.1)    
Reclassification from AOCI, Current Period, Tax 0.0 (1.5)    
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent (0.1) 5.8    
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent (39.8) 135.2    
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 147.4 (509.3)    
AOCI, Liability for Future Policy Benefit, Parent        
Stockholders' Equity Attributable to Parent 154.4 (405.5)    
OCI, before Reclassifications, Net of Tax, Attributable to Parent (86.7) 444.2    
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent 0.0 0.0    
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent $ (86.7) $ 444.2