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RELATED PARTY TRANSACTIONS - Additional Information (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Related Party Transaction [Line Items]      
Reimbursement Agreements termination period by either party 90 days    
Insurance program renewal period 5 years    
Reimbursement Agreement [Member]      
Related Party Transaction [Line Items]      
Reimbursements from (to) related party $ 1.4 $ 2.3  
Payable balance 0.0    
Receivable balance     $ 0.1
Majority Shareholder [Member] | Related Party Expense, Coupon Redemptions [Member]      
Related Party Transaction [Line Items]      
Expenses - related party transaction 24.8 16.1  
Majority Shareholder [Member] | Related Party Expense, Coupon Redemption Processing [Member]      
Related Party Transaction [Line Items]      
Expenses - related party transaction 0.2 0.2  
Majority Shareholder [Member] | Related Party Expense, Other Fees (less than) [Member]      
Related Party Transaction [Line Items]      
Expenses - related party transaction $ 0.2 $ 0.2