FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Recurring Basis
Fair Value, Assets Measured on Recurring and Nonrecurring Basis
Cash equivalents	$ 3.0	$ 3.6
Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on Recurring and Nonrecurring Basis
Cash equivalents	3.0	3.6
Recurring Basis | Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on Recurring and Nonrecurring Basis
Cash equivalents	0.0	0.0
Recurring Basis | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring and Nonrecurring Basis
Cash equivalents	0.0	0.0
Carrying value
Fair Value, Assets Measured on Recurring and Nonrecurring Basis
Debt	226.0	190.2
Fair value | Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on Recurring and Nonrecurring Basis
Debt	$ 230.0	$ 195.0