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Investments - Distribution of Fixed Maturity Securities by Expected Maturity (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Percent of Total Fair Value    
Due in 1 year Or less (percent) 5.60% 4.40%
Due after 1 year through 5 years (percent) 27.10% 26.30%
Due after 5 years through 10 years (percent) 27.40% 27.90%
Due after 10 years through 20 years (percent) 23.90% 25.00%
Due after 20 years (percent) 16.00% 16.40%
Total (percent) 100.00% 100.00%
Fair Value    
Due in 1 year or less $ 278.3  
Due after 1 year through 5 years 1,343.4  
Due after 5 years through 10 years 1,357.3  
Due after 10 years through 20 years 1,187.1  
Due after 20 years 795.5  
Total 4,961.6 $ 5,185.0
Amortized Cost, net    
Due in 1 year or less 287.8  
Due after 1 year through 5 years 1,420.7  
Due after 5 years through 10 years 1,480.7  
Due after 10 years through 20 years 1,417.8  
Due after 20 years 1,034.6  
Amortized Cost, net $ 5,641.6 $ 5,756.9
Average option-adjusted duration, in years 6 years 1 month 6 days 6 years 4 months 24 days