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FAIR VALUE MEASUREMENTS (FAIR VALUE ASSETS AND LIABILITIES MEASURED ON A RECURRING BASIS, UNOBSERVABLE INPUT RECONCILIATION - ACTIVITY) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Future policy benefits - embedded derivatives associated with fixed index annuity products [Member]    
Liabilities:    
Purchases $ (148.3) $ (137.8)
Received in reinsurance recapture 0.0  
Sales 21.2 64.4
Issuances (28.9) (4.0)
Settlements 60.0 65.5
Purchases, sales, issuances and settlements, net 96.0 11.9
Corporate securities [Member]    
Assets:    
Purchases 18.5 62.2
Received in reinsurance recapture 89.2  
Sales (31.2) (31.2)
Issuances 0.0 0.0
Settlements 0.0 0.0
Purchases, sales, issuances and settlements, net 76.5 31.0
States and political subdivisions [Member]    
Assets:    
Purchases   0.0
Sales   (35.5)
Issuances   0.0
Settlements   0.0
Purchases, sales, issuances and settlements, net   (35.5)
Foreign Government Debt Securities [Member]    
Assets:    
Purchases 4.0  
Received in reinsurance recapture 0.0  
Sales 0.0  
Issuances 0.0  
Settlements 0.0  
Purchases, sales, issuances and settlements, net 4.0  
Asset-backed securities [Member]    
Assets:    
Purchases 16.9 13.7
Received in reinsurance recapture 0.0  
Sales (7.2) (7.0)
Issuances 0.0 0.0
Settlements 0.0 0.0
Purchases, sales, issuances and settlements, net 9.7 6.7
Collateralized debt obligations [Member]    
Assets:    
Purchases 5.4  
Received in reinsurance recapture 0.0  
Sales 0.0  
Issuances 0.0  
Settlements 0.0  
Purchases, sales, issuances and settlements, net 5.4  
Commercial Mortgage Backed Securities [Member]    
Assets:    
Purchases 17.0 0.0
Received in reinsurance recapture 0.0  
Sales (0.1) (0.1)
Issuances 0.0 0.0
Settlements 0.0 0.0
Purchases, sales, issuances and settlements, net 16.9 (0.1)
Mortgage pass-through securities [Member]    
Assets:    
Purchases 0.0 0.0
Received in reinsurance recapture 0.0  
Sales (0.1) (0.3)
Issuances 0.0 0.0
Settlements 0.0 0.0
Purchases, sales, issuances and settlements, net (0.1) (0.3)
Total fixed maturities, available for sale [Member]    
Assets:    
Purchases 61.8 75.9
Received in reinsurance recapture 89.2  
Sales (38.6) (74.1)
Issuances 0.0 0.0
Settlements 0.0 0.0
Purchases, sales, issuances and settlements, net 112.4 1.8
Equity securities - corporate securities [Member]    
Assets:    
Purchases 3.3 4.0
Received in reinsurance recapture 2.2  
Sales 0.0 0.0
Issuances 0.0 0.0
Settlements 0.0 0.0
Purchases, sales, issuances and settlements, net 5.5 4.0
Trading securities, corporate securities [Member]    
Assets:    
Purchases 0.2  
Received in reinsurance recapture 0.0  
Sales (0.2)  
Issuances 0.0  
Settlements 0.0  
Purchases, sales, issuances and settlements, net 0.0  
Trading securities - commercial mortgage-backed securities [Member]    
Assets:    
Purchases   9.5
Sales   0.0
Issuances   0.0
Settlements   0.0
Purchases, sales, issuances and settlements, net $ 0.0 $ 9.5