RELATED PARTY TRANSACTIONS - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Related Party Transaction [Line Items]
Reimbursement Agreements termination notice period	90 days
Insurance program renewal period	5 years
Reimbursements [Member]
Related Party Transaction [Line Items]
Expenses related party	$ 0.1	$ 3.9
Payable from related party	0.1		$ 0.3
Majority Shareholder [Member] | Related Party Expense, Coupon Redemptions [Member]
Related Party Transaction [Line Items]
Expenses related party	7.4	12.0
Majority Shareholder [Member] | Related Party Expense, Coupon Redemption Processing [Member]
Related Party Transaction [Line Items]
Expenses related party	0.1
Majority Shareholder [Member] | Related Party Expense, Other Fees (less than) [Member]
Related Party Transaction [Line Items]
Expenses related party	$ 0.1	$ 0.1