FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 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	206.9
Carrying amount of long-term debt	206.3
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
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]
Gross unrealized gains associated with the investment held in the rabbi trust, gross	0.7	0.7
Available-for-sale securities measured at fair value	$ 6.5	$ 6.5