DEBT - Components of Interest Expense-net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Disclosure [Abstract]
Interest expense	$ 74.6	$ 69.9	$ 59.2
Interest income	(9.6)	(9.6)	(8.6)
Interest expense-net	65.0	60.3	50.6
Interest payments, net of amounts related to interest rate swaps	$ 66.6	$ 72.5	$ 72.0