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STATUTORY INFORMATION AND DIVIDEND RESTRICTIONS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
STATUTORY INFORMATION AND DIVIDEND RESTRICTIONS [Abstract]      
Statutory surplus of the Company's insurance subsidiaries $ 527.1 $ 560.1  
Statutory net income (loss) $ 10.8 $ 30.1 $ 48.3
Risk-based capital model assessment for Company At December 31, 2018, the Company’s insurance subsidiaries had total adjusted statutory capital well in excess of the minimum risk-based capital requirement.    
Statutory accounting practices, statutory capital and surplus required $ 101.9    
Percentage of statutory surplus as maximum dividend allowable without prior approval of insurance regulatory authorities (in hundredths) 10.00% 10.00% 10.00%
Amount available for distribution to the Company without prior approval $ 48.0