ACCUMULATED OTHER COMPREHENSIVE LOSS - ROLLFORWARD (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Changes in accumulated other comprehensive loss
Accumulated other comprehensive loss, balance at beginning of period	$ (23.6)	$ (39.3)	$ (23.2)	$ (40.9)
Other comprehensive income (loss) before reclassifications	0	0.6	(0.1)	0.7
Amounts reclassified out of accumulated other comprehensive loss	0.7	2.1	0.4	3.6
Other comprehensive income, net of tax	0.7	2.7	0.3	4.3
Accumulated other comprehensive loss, balance at end of period	(22.9)	(36.6)	(22.9)	(36.6)
Cash flow hedges
Changes in accumulated other comprehensive loss
Accumulated other comprehensive loss, balance at beginning of period	(3.7)	(4.2)	(3.1)	(5.2)
Other comprehensive income (loss) before reclassifications	0	0.6	0	0.7
Amounts reclassified out of accumulated other comprehensive loss	0.2	1.5	(0.4)	2.4
Other comprehensive income, net of tax	0.2	2.1	(0.4)	3.1
Accumulated other comprehensive loss, balance at end of period	(3.5)	(2.1)	(3.5)	(2.1)
Defined benefit plans
Changes in accumulated other comprehensive loss
Accumulated other comprehensive loss, balance at beginning of period	(19.9)	(35.1)	(20.1)	(35.7)
Other comprehensive income (loss) before reclassifications	0	0	(0.1)	0
Amounts reclassified out of accumulated other comprehensive loss	0.5	0.6	0.8	1.2
Other comprehensive income, net of tax	0.5	0.6	0.7	1.2
Accumulated other comprehensive loss, balance at end of period	$ (19.4)	$ (34.5)	$ (19.4)	$ (34.5)