FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers in out between levels	$ 0.0	$ 0.0
Fair value of long-term debt	197.1
Carrying amount of long-term debt	197.7
SERP [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities carrying amount	0.1	0.1
Combined fair value of available-for-sale securities	0.1	0.1
Gross unrealized gains	0.1	0.1
Investments held in Rabbi Trust [Member] | SERP [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities carrying amount	3.6	6.5
Proceeds on investments	2.8
Gross unrealized gains associated with the investment held in the rabbi trust	0.6	0.7
Combined fair value of available-for-sale securities	3.6	6.5
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