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RELATED PARTY TRANSACTIONS - Additional Information (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Related Party Transaction [Line Items]      
Reimbursement Agreements termination notice period 90 days    
Insurance program renewal period 5 years    
Reimbursements      
Related Party Transaction [Line Items]      
Expenses related party $ 0.0 $ 4.0  
Receivable from related party 0.1    
Payable from related party     $ 0.3
Majority Shareholder | Related Party Expense, Coupon Redemptions      
Related Party Transaction [Line Items]      
Expenses related party 13.0 18.5  
Majority Shareholder | Related Party Expense, Coupon Redemption Processing      
Related Party Transaction [Line Items]      
Expenses related party 0.1 0.2  
Majority Shareholder | Related Party Expense, Other Fees (less than)      
Related Party Transaction [Line Items]      
Expenses related party $ 0.2 $ 0.2