GOODWILL AND OTHER INTANGIBLE ASSETS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Depreciation and amortization	Mar. 31, 2014 Contractual service agreements	Dec. 31, 2013 Contractual service agreements
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in the carrying amount of goodwill	$ 0	$ 0
Contractual service agreements
Contractual service agreements, gross carrying amount				15.6	15.6
Contractual service agreements, accumulated amortization				(2.4)	(1.8)
Contractual service agreements, net carrying amount				13.2	13.8
Amortization period				6 years
Amortization expense			0.6
Amortization expense for the next five years
Future amortization expense period	5 years
Amortization expense, 2014			2.2
Amortization expense, 2015			2.2
Amortization expense, 2016			2.2
Amortization expense, 2017			2.2
Amortization expense, 2018			$ 2.2