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RELATED PARTY TRANSACTIONS - Additional Information (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Related Party Transaction [Line Items]      
Reimbursement Agreements termination notice period 90 days    
Insurance program renewal period 5 years    
Reimbursement Agreements      
Related Party Transaction [Line Items]      
Expenses related party $ 3.6 $ 1.3  
Receivable from related party 0.5    
Payable to related party     $ 0.2
Majority Shareholder | Related party expense, coupon redemptions      
Related Party Transaction [Line Items]      
Expenses related party 24.4 35.1  
Majority Shareholder | Related party expense, coupon redemption processing      
Related Party Transaction [Line Items]      
Expenses related party 0.2 0.3  
Majority Shareholder | Related party expense, other fees      
Related Party Transaction [Line Items]      
Expenses related party $ 0.3 $ 0.3