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Long-Duration Insurance Contracts - Deferred Policy Acquisition Costs, Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]        
Balance, beginning of period     $ 336.3  
Amortization expense $ (27.0) $ (25.4) (54.0) $ (49.1)
Balance, end of period 341.5   341.5  
Whole Life Insurance        
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]        
Balance, beginning of period 22.6   22.3  
Capitalizations 0.7   1.4  
Amortization expense (0.3)   (0.6)  
Experience adjustment 0.0   (0.1)  
Balance, end of period 23.0   23.0  
Term Life Insurance        
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]        
Balance, beginning of period 32.9   32.6  
Capitalizations 1.4   2.6  
Amortization expense (0.8)   (1.7)  
Experience adjustment 0.0   0.0  
Balance, end of period 33.5   33.5  
Experience Life Insurance        
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]        
Balance, beginning of period 5.7   5.7  
Capitalizations 0.0   0.1  
Amortization expense (0.1)   (0.2)  
Experience adjustment 0.0   0.0  
Balance, end of period 5.6   5.6  
Limited Pay Whole Life Insurance        
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]        
Balance, beginning of period 7.5   7.4  
Capitalizations 0.3   0.5  
Amortization expense (0.1)   (0.2)  
Experience adjustment 0.0   0.0  
Balance, end of period 7.7   7.7  
Indexed Universal Life Insurance        
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]        
Balance, beginning of period 17.1   16.8  
Capitalizations 0.9   1.6  
Amortization expense (0.2)   (0.5)  
Experience adjustment 0.0   (0.1)  
Balance, end of period 17.8   17.8  
Supplemental health        
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]        
Balance, beginning of period 8.7   8.2  
Capitalizations 0.8   1.6  
Amortization expense (0.2)   (0.4)  
Experience adjustment 0.0   (0.1)  
Balance, end of period 9.3   9.3  
Total Annuities        
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]        
Balance, beginning of period 212.9   214.0  
Capitalizations 4.1   8.0  
Amortization expense (4.2)   (7.9)  
Experience adjustment (0.4)   (1.7)  
Balance, end of period $ 212.4   $ 212.4