ACCUMULATED OTHER COMPREHENSIVE LOSS - ROLL FORWARD (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Changes to accumulated other comprehensive loss, net of tax
Accumulated other comprehensive loss, balance at beginning of period	$ (27.6)	$ (23.2)
Other comprehensive loss before reclassifications		(0.1)
Amounts reclassified out of accumulated other comprehensive loss	0.8	(0.3)
Other comprehensive income (loss), net of tax	0.8	(0.4)
Accumulated other comprehensive loss, balance at end of period	(26.8)	(23.6)
Cash flow hedges
Changes to accumulated other comprehensive loss, net of tax
Accumulated other comprehensive loss, balance at beginning of period	(3.2)	(3.1)
Other comprehensive loss before reclassifications		0
Amounts reclassified out of accumulated other comprehensive loss	0.1	(0.6)
Other comprehensive income (loss), net of tax		(0.6)
Accumulated other comprehensive loss, balance at end of period	(3.1)	(3.7)
Defined benefit plans
Changes to accumulated other comprehensive loss, net of tax
Accumulated other comprehensive loss, balance at beginning of period	(24.4)	(20.1)
Other comprehensive loss before reclassifications		(0.1)
Amounts reclassified out of accumulated other comprehensive loss	0.7	0.3
Other comprehensive income (loss), net of tax		0.2
Accumulated other comprehensive loss, balance at end of period	$ (23.7)	$ (19.9)