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RECENTLY ADOPTED ACCOUNTING STANDARDS - Impact of Adoption Transition (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Present value of future profits $ 186.2 $ 210.0 $ 186.2 $ 210.0   $ 203.7   $ 230.1 $ 259.6  
Deferred acquisition costs 1,897.5   1,897.5     1,770.9     1,485.8  
Reinsurance receivables 4,053.2   4,053.2     4,223.4        
Market risk benefit asset 89.3 56.3 89.3 56.3   65.3     2.5  
Income tax assets, net 1,039.8   1,039.8     1,063.4     806.4  
Total assets 33,507.4   33,507.4     33,133.1        
Policyholder account balances 15,481.8 15,079.7 15,481.8 15,079.7   15,234.2     12,367.7  
Future policy benefits 10,829.9   10,829.9     11,240.2     15,704.9  
Market risk benefit liability 3.1 13.7 3.1 13.7   11.3     114.8  
Liability for life insurance policy claims 60.8   60.8     64.1        
Total liabilities 31,617.3   31,617.3     31,364.3        
Retained earnings 1,880.4   1,880.4     1,691.2        
Accumulated other comprehensive income (loss) (1,956.7)   (1,956.7)     (1,957.3)        
Total shareholders' equity 1,890.1 1,863.4 1,890.1 1,863.4 $ 1,995.8 1,768.8 $ 2,127.9 $ 3,684.7    
Insurance policy benefits 399.1 396.1 1,574.7 1,032.2            
Liability for future policy benefits remeasurement loss 0.1 5.0 (8.8) (2.3)            
Change in fair value of market risk benefits (33.8) (34.9) (36.6) (117.9)            
Amortization of deferred acquisition costs and present value of future profits 57.0 53.5 168.5 158.5            
Other operating costs and expenses 247.1 230.1 775.3 670.9            
Total benefits and expenses 731.9 677.4 2,665.6 1,835.2            
Income before income taxes 215.6 227.9 310.7 768.0            
Income tax expense on period income 48.3 52.0 70.5 175.4            
Net income $ 167.3 $ 175.9 $ 240.2 $ 592.6            
Earnings per common share - basic (in dollars per share) $ 1.48 $ 1.54 $ 2.11 $ 5.10            
Earnings per common share - diluted (in dollars per share) $ 1.46 $ 1.52 $ 2.08 $ 5.02            
Amount prior to adoption of ASU 2018-12                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Present value of future profits           212.2     249.4 $ 249.4
Deferred acquisition costs           1,913.4     1,027.8 1,027.8
Reinsurance receivables           4,241.7       4,584.3
Market risk benefit asset           0.0     0.0 0.0
Income tax assets, net           1,165.5     199.4 199.4
Total assets           33,339.2       35,339.9
Policyholder account balances           14,858.3     12,540.6 12,540.6
Future policy benefits           11,809.1     11,744.2 11,744.2
Market risk benefit liability           0.0     0.0 0.0
Liability for life insurance policy claims           456.5       561.8
Total liabilities           31,938.4       29,855.7
Retained earnings   $ 1,431.9   $ 1,431.9   1,459.0       752.3
Accumulated other comprehensive income (loss)   (2,165.7)   (2,165.7)   (2,093.1)       2,186.1
Total shareholders' equity   1,297.9   1,297.9   1,400.8       $ 5,484.2
Insurance policy benefits   412.2   1,099.1            
Liability for future policy benefits remeasurement loss   0.0   0.0            
Change in fair value of market risk benefits   0.0   0.0            
Amortization of deferred acquisition costs and present value of future profits   87.5   279.5            
Other operating costs and expenses   230.8   673.5            
Total benefits and expenses   768.1   2,141.3            
Income before income taxes   137.2   461.9            
Income tax expense on period income   32.2   108.5            
Net income   $ 105.0   $ 353.4            
Earnings per common share - basic (in dollars per share)   $ 0.92   $ 3.04            
Earnings per common share - diluted (in dollars per share)   $ 0.91   $ 2.99            
Effect of adoption                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Present value of future profits           (8.5)        
Deferred acquisition costs           (142.5)        
Reinsurance receivables           (18.3)        
Market risk benefit asset           65.3        
Income tax assets, net           (102.1)        
Total assets           (206.1)        
Policyholder account balances           375.9        
Future policy benefits           (568.9)        
Market risk benefit liability           11.3        
Liability for life insurance policy claims           (392.4)        
Total liabilities           (574.1)        
Retained earnings   $ 237.6   $ 237.6   232.2        
Accumulated other comprehensive income (loss)   327.9   327.9   135.8        
Total shareholders' equity   565.5   565.5   368.0        
Insurance policy benefits   (16.1)   (66.9)            
Liability for future policy benefits remeasurement loss   (5.0)   2.3            
Change in fair value of market risk benefits   (34.9)   (117.9)            
Amortization of deferred acquisition costs and present value of future profits   (34.0)   (121.0)            
Other operating costs and expenses   (0.7)   (2.6)            
Total benefits and expenses   (90.7)   (306.1)            
Income before income taxes   90.7   306.1            
Income tax expense on period income   19.8   66.9            
Net income   $ 70.9   $ 239.2            
Earnings per common share - basic (in dollars per share)   $ 0.62   $ 2.06            
Earnings per common share - diluted (in dollars per share)   $ 0.61   $ 2.03            
Effect of adoption                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Present value of future profits                 10.2  
Deferred acquisition costs                 458.0  
Reinsurance receivables                 144.1  
Market risk benefit asset                 2.5  
Income tax assets, net                 607.0  
Total assets                 1,221.8  
Policyholder account balances                 (172.9)  
Future policy benefits                 3,960.7  
Market risk benefit liability                 114.8  
Liability for life insurance policy claims                 (470.1)  
Total liabilities                 3,432.5  
Retained earnings                 (130.9)  
Accumulated other comprehensive income (loss)                 (2,079.8)  
Total shareholders' equity                 (2,210.7)  
As recast                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Present value of future profits           203.7     259.6  
Deferred acquisition costs           1,770.9     1,485.8  
Reinsurance receivables           4,223.4     4,728.4  
Market risk benefit asset           65.3     2.5  
Income tax assets, net           1,063.4     806.4  
Total assets           33,133.1     36,561.7  
Policyholder account balances           15,234.2     12,367.7  
Future policy benefits           11,240.2     15,704.9  
Market risk benefit liability           11.3     114.8  
Liability for life insurance policy claims           64.1     91.7  
Total liabilities           31,364.3     33,288.2  
Retained earnings   $ 1,669.5   $ 1,669.5   1,691.2     621.4  
Accumulated other comprehensive income (loss)   (1,837.8)   (1,837.8)   (1,957.3)     106.3  
Total shareholders' equity   1,863.4   1,863.4   $ 1,768.8     $ 3,273.5  
Insurance policy benefits   396.1   1,032.2            
Liability for future policy benefits remeasurement loss   (5.0)   2.3            
Change in fair value of market risk benefits   (34.9)   (117.9)            
Amortization of deferred acquisition costs and present value of future profits   53.5   158.5            
Other operating costs and expenses   230.1   670.9            
Total benefits and expenses   677.4   1,835.2            
Income before income taxes   227.9   768.0            
Income tax expense on period income   52.0   175.4            
Net income   $ 175.9   $ 592.6            
Earnings per common share - basic (in dollars per share)   $ 1.54   $ 5.10            
Earnings per common share - diluted (in dollars per share)   $ 1.52   $ 5.02