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BUSINESS AND BASIS OF PRESENTATION - Errors on Prior Period (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Mar. 31, 2024
Investments:          
Fixed maturities, available for sale, at fair value (net of allowance for credit losses: June 30, 2025 - $39.1 and December 31, 2024 - $37.1; amortized cost: June 30, 2025 - $25,228.8 and December 31, 2024 - $25,151.0)   $ 22,730.1 $ 23,047.0    
Equity securities at fair value   272.4 387.4    
Investments held by variable interest entities   433.8 376.9    
Total investments   27,873.6 28,592.0    
Income tax assets, net   814.1 749.3    
Total assets   37,849.3 37,329.1    
Liabilities:          
Policyholder account balances   17,594.2 17,609.0 $ 16,247.9  
Other liabilities   1,163.3 935.8    
Total liabilities   35,334.1 34,806.4    
Shareholders' equity:          
Retained earnings   2,253.1 2,333.0    
Total shareholders' equity $ 2,555.1 2,515.2 2,522.7 2,428.9 $ 2,367.7
Total liabilities and shareholders' equity   37,849.3 37,329.1    
Consolidated Statement of Shareholders' Equity          
Balance, beginning of period 2,515.2 2,215.6      
Balance, end of period 2,555.1 2,515.2      
Retained earnings          
Shareholders' equity:          
Total shareholders' equity 2,258.2 2,253.1 $ 2,333.0 $ 2,094.5 $ 1,995.7
Consolidated Statement of Shareholders' Equity          
Balance, beginning of period 2,253.1 1,899.8      
Correction of immaterial error 24.6 16.8      
Balance, end of period 2,258.2 2,253.1      
As Previously Reported          
Investments:          
Fixed maturities, available for sale, at fair value (net of allowance for credit losses: June 30, 2025 - $39.1 and December 31, 2024 - $37.1; amortized cost: June 30, 2025 - $25,228.8 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      
Consolidated Statement of Shareholders' Equity          
Balance, beginning of period 2,498.4        
Balance, end of period   2,498.4      
As Previously Reported | Retained earnings          
Shareholders' equity:          
Total shareholders' equity 2,233.6 2,236.3      
Consolidated Statement of Shareholders' Equity          
Balance, beginning of period 2,236.3        
Balance, end of period 2,233.6 2,236.3      
Adjustments          
Investments:          
Fixed maturities, available for sale, at fair value (net of allowance for credit losses: June 30, 2025 - $39.1 and December 31, 2024 - $37.1; amortized cost: June 30, 2025 - $25,228.8 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)      
Consolidated Statement of Shareholders' Equity          
Balance, beginning of period 16.8        
Balance, end of period   16.8      
Adjustments | Retained earnings          
Shareholders' equity:          
Total shareholders' equity 2,258.2 2,253.1      
Consolidated Statement of Shareholders' Equity          
Balance, beginning of period 2,253.1        
Balance, end of period $ 2,258.2 $ 2,253.1