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FAIR VALUE MEASUREMENTS - BALANCE SHEET RECURRING (Details) - Significant unobservable inputs  (Level 3) - Fair Value, Measurements, Recurring - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Embedded derivatives associated with fixed index annuity products (classified as policyholder account liabilities)        
Liabilities:        
Beginning balance $ (1,549.3) $ (1,548.5) $ (1,644.5) $ (1,565.4)
Purchases, sales, issuances and settlements, net (85.0) (66.3) (153.3) 27.3
Total realized and unrealized gains (losses) included in net income (60.7) 87.9 102.8 11.2
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) 0.0 0.0 0.0 0.0
Transfers into level 3 0.0 0.0 0.0 0.0
Transfers out of level 3 0.0 0.0 0.0 0.0
Ending balance (1,695.0) (1,526.9) (1,695.0) (1,526.9)
Amount of total gains (losses) for the period included in our net income relating to assets and liabilities still held as of the reporting date (60.7) 87.9 102.8 11.2
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets and liabilities still held as of the reporting date 0.0 0.0 0.0 0.0
Corporate securities        
Assets:        
Beginning balance 133.5 127.8 146.9 178.8
Purchases, sales, issuances and settlements, net 0.0 (0.1) (0.1) (2.3)
Total realized and unrealized gains (losses) included in net income (1.1) (0.1) (0.2) 0.0
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) 3.4 8.3 1.2 5.8
Transfers into level 3 0.0 9.0 6.1 81.5
Transfers out of level 3 (53.3) (30.7) (71.4) (149.6)
Ending balance 82.5 114.2 82.5 114.2
Amount of total gains (losses) included in our net income relating to assets and liabilities still held as of the reporting date (1.1) (0.1) (0.2) (0.1)
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets and liabilities still held as of the reporting date 2.9 7.8 0.2 4.6
Corporate securities | Variable Interest Entity, Primary Beneficiary        
Assets:        
Beginning balance   0.6   0.0
Purchases, sales, issuances and settlements, net   0.0   0.0
Total realized and unrealized gains (losses) included in net income   0.0   0.0
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss)   0.1   0.1
Transfers into level 3   0.3   0.3
Transfers out of level 3   (0.6)   0.0
Ending balance   0.4   0.4
Amount of total gains (losses) included in our net income relating to assets and liabilities still held as of the reporting date   0.0   0.0
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets and liabilities still held as of the reporting date   0.1   0.1
Foreign governments        
Assets:        
Beginning balance       1.1
Purchases, sales, issuances and settlements, net       0.0
Total realized and unrealized gains (losses) included in net income       0.0
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss)       0.0
Transfers into level 3       0.0
Transfers out of level 3       (1.1)
Ending balance   0.0   0.0
Amount of total gains (losses) included in our net income relating to assets and liabilities still held as of the reporting date       0.0
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets and liabilities still held as of the reporting date       0.0
Asset-backed securities        
Assets:        
Beginning balance 11.8 30.9 14.3 12.6
Purchases, sales, issuances and settlements, net (0.1) (0.1) (0.3) (0.3)
Total realized and unrealized gains (losses) included in net income 0.0 0.0 0.0 0.0
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) 0.3 (0.6) 0.0 0.3
Transfers into level 3 0.0 0.0 0.0 0.0
Transfers out of level 3 0.0 (17.6) (2.0) 0.0
Ending balance 12.0 12.6 12.0 12.6
Amount of total gains (losses) included in our net income relating to assets and liabilities still held as of the reporting date 0.0 0.0 0.0 0.0
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets and liabilities still held as of the reporting date 0.3 (0.6) 0.0 0.3
Non-agency residential mortgage-backed securities        
Assets:        
Beginning balance     1.6  
Purchases, sales, issuances and settlements, net     0.0  
Total realized and unrealized gains (losses) included in net income     0.0  
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss)     0.0  
Transfers into level 3     0.0  
Transfers out of level 3     (1.6)  
Ending balance 0.0   0.0  
Amount of total gains (losses) included in our net income relating to assets and liabilities still held as of the reporting date     0.0  
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets and liabilities still held as of the reporting date     0.0  
Total fixed maturities, available for sale        
Assets:        
Beginning balance 145.3 165.9 162.8 192.5
Purchases, sales, issuances and settlements, net (0.1) (1.4) (0.4) (2.6)
Total realized and unrealized gains (losses) included in net income (1.1) (7.0) (0.2) 0.0
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) 3.7 8.6 1.2 6.1
Transfers into level 3 0.0 9.0 6.1 81.5
Transfers out of level 3 (53.3) (48.3) (75.0) (150.7)
Ending balance 94.5 126.8 94.5 126.8
Amount of total gains (losses) included in our net income relating to assets and liabilities still held as of the reporting date (1.1) (0.1) (0.2) (0.1)
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets and liabilities still held as of the reporting date 3.2 7.2 0.2 4.9
Equity securities - corporate securities        
Assets:        
Beginning balance 26.8 8.3 26.8 8.3
Purchases, sales, issuances and settlements, net 0.2 0.0 0.2 0.0
Total realized and unrealized gains (losses) included in net income 0.0 0.0 0.0 0.0
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) 0.0 0.0 0.0 0.0
Transfers into level 3 0.0 0.0 0.0 0.0
Transfers out of level 3 0.0 0.0 0.0 0.0
Ending balance 27.0 8.3 27.0 8.3
Amount of total gains (losses) included in our net income relating to assets and liabilities still held as of the reporting date 0.0 0.0 0.0 0.0
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets and liabilities still held as of the reporting date 0.0 0.0 0.0 0.0
Commercial mortgage-backed securities        
Assets:        
Beginning balance   7.2    
Purchases, sales, issuances and settlements, net   (1.2)    
Total realized and unrealized gains (losses) included in net income   (6.9)    
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss)   0.9    
Transfers into level 3   0.0    
Transfers out of level 3   0.0    
Ending balance   0.0   0.0
Amount of total gains (losses) included in our net income relating to assets and liabilities still held as of the reporting date   0.0    
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets and liabilities still held as of the reporting date   0.0    
Non-agency residential mortgage-backed securities        
Assets:        
Beginning balance 5.6   5.9  
Purchases, sales, issuances and settlements, net (0.8)   (1.1)  
Total realized and unrealized gains (losses) included in net income 0.0   (0.2)  
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) 0.0   0.2  
Transfers into level 3 0.0   0.0  
Transfers out of level 3 0.0   0.0  
Ending balance 4.8   4.8  
Amount of total gains (losses) included in our net income relating to assets and liabilities still held as of the reporting date 0.0   (0.2)  
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets and liabilities still held as of the reporting date (0.2)   0.0  
Trading securities - commercial mortgage-backed securities        
Assets:        
Beginning balance 12.4 10.9 17.0 12.5
Purchases, sales, issuances and settlements, net 0.0 0.0 0.0 0.0
Total realized and unrealized gains (losses) included in net income 0.0 0.9 (0.1) (0.8)
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) 0.2 0.2 0.4 0.3
Transfers into level 3 0.0 0.0 0.0 0.0
Transfers out of level 3 0.0 0.0 (4.7) 0.0
Ending balance 12.6 12.0 12.6 12.0
Amount of total gains (losses) included in our net income relating to assets and liabilities still held as of the reporting date 0.0 0.9 (0.1) (0.8)
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets and liabilities still held as of the reporting date 0.0 $ 0.0 0.0 $ 0.0
Total trading securities        
Assets:        
Beginning balance 18.0   22.9  
Purchases, sales, issuances and settlements, net (0.8)   (1.1)  
Total realized and unrealized gains (losses) included in net income 0.0   (0.3)  
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) 0.2   0.6  
Transfers into level 3 0.0   0.0  
Transfers out of level 3 0.0   (4.7)  
Ending balance 17.4   17.4  
Amount of total gains (losses) included in our net income relating to assets and liabilities still held as of the reporting date 0.0   (0.3)  
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets and liabilities still held as of the reporting date $ (0.2)   $ 0.0