RELATED PARTY TRANSACTIONS - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 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	$ 3.9	$ 1.4
Payable to related party	0.2		$ 0.2
Majority Shareholder [Member] | Related party expense, coupon redemptions
Related Party Transaction [Line Items]
Expenses related party	12.0	13.7
Majority Shareholder [Member] | Related party expense, coupon redemption processing
Related Party Transaction [Line Items]
Expenses related party	0.1	0.1
Majority Shareholder [Member] | Related party expense, other fees
Related Party Transaction [Line Items]
Expenses related party	$ 0.1	$ 0.1