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BUSINESS AND BASIS OF PRESENTATION - Errors on Prior Period (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Investments:              
Fixed maturities, available for sale, at fair value (net of allowance for credit losses: September 30, 2025 - $33.0 and December 31, 2024 - $37.1; amortized cost: September 30, 2025 - $25,219.3 and December 31, 2024 - $25,151.0) $ 23,405.3     $ 22,730.1      
Equity securities at fair value 377.2     272.4      
Investments held by variable interest entities 296.8     433.8      
Total investments 29,177.1     27,873.6      
Income tax assets, net 708.1     814.1      
Total assets 38,296.2     37,849.3      
Liabilities:              
Policyholder account balances 18,290.3     17,594.2 $ 16,992.4    
Other liabilities 1,036.9     1,163.3      
Total liabilities 35,685.2     35,334.1      
Shareholders' equity:              
Retained earnings 2,339.5     2,253.1      
Total shareholders' equity 2,611.0 $ 2,522.7   2,515.2 2,687.8 $ 2,428.9 $ 2,215.6
Total liabilities and shareholders' equity 38,296.2     37,849.3      
Retained earnings              
Shareholders' equity:              
Total shareholders' equity $ 2,339.5 $ 2,333.0 $ 2,258.2 2,253.1 $ 2,086.9 $ 2,094.5 $ 1,899.8
As Previously Reported              
Investments:              
Fixed maturities, available for sale, at fair value (net of allowance for credit losses: September 30, 2025 - $33.0 and December 31, 2024 - $37.1; amortized cost: September 30, 2025 - $25,219.3 and December 31, 2024 - $25,151.0)       22,840.5      
Equity securities at fair value       162.0      
Investments held by variable interest entities       432.3      
Total investments       27,872.1      
Income tax assets, net       818.9      
Total assets       37,852.6      
Liabilities:              
Policyholder account balances       17,615.8      
Other liabilities       1,161.8      
Total liabilities       35,354.2      
Shareholders' equity:              
Retained earnings       2,236.3      
Total shareholders' equity       2,498.4      
Total liabilities and shareholders' equity       37,852.6      
As Previously Reported | Retained earnings              
Shareholders' equity:              
Total shareholders' equity     2,233.6 2,236.3      
Adjustments              
Investments:              
Fixed maturities, available for sale, at fair value (net of allowance for credit losses: September 30, 2025 - $33.0 and December 31, 2024 - $37.1; amortized cost: September 30, 2025 - $25,219.3 and December 31, 2024 - $25,151.0)       (110.4)      
Equity securities at fair value       110.4      
Investments held by variable interest entities       1.5      
Total investments       1.5      
Income tax assets, net       (4.8)      
Total assets       (3.3)      
Liabilities:              
Policyholder account balances       (21.6)      
Other liabilities       1.5      
Total liabilities       (20.1)      
Shareholders' equity:              
Retained earnings       16.8      
Total shareholders' equity       16.8      
Total liabilities and shareholders' equity       (3.3)      
Adjustments | Retained earnings              
Shareholders' equity:              
Total shareholders' equity     $ 24.6 $ 16.8