GOODWILL AND OTHER INTANGIBLE ASSETS (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Changes to the carrying amount of goodwill		$ 0.0	$ 0.0
Goodwill impairment loss	$ 0.0	0.0	$ 6.7
Intangible assets other than goodwill
Amortized intangible assets, gross carrying amount	27.1	27.1		$ 34.9
Amortized intangible assets, accumulated amortization	(11.6)	(11.6)		(11.9)
Amortized intangible assets, net carrying amount	15.5	15.5		23.0
Unamortized intangible assets, carrying amount	10.7	10.7		10.2
Total intangible assets, gross carrying amount	37.8	37.8		45.1
Total intangible assets, net carrying amount	$ 26.2	$ 26.2		$ 33.2
Remaining weighted-average amortization period		5 years