FAIR VALUE MEASUREMENTS (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) Transfer	Dec. 31, 2015 USD ($) Transfer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers in out between levels | Transfer	0	0
Fair value of total debt	$ 144.3	$ 188.1
Carrying amount of long-term debt	141.2	183.5
Investments held in Rabbi Trust [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities measured at fair value	1.7	3.6
Investments held in Rabbi Trust [Member] | SERP [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross unrealized gains associated with the investment held in the rabbi trust	0.7	0.7
Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets accounted at fair value	$ 0.0	$ 0.0