GOODWILL AND OTHER INTANGIBLE ASSETS (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Depreciation and amortization	Jun. 30, 2013 Depreciation and amortization	Jun. 30, 2014 Depreciation and amortization	Jun. 30, 2013 Depreciation and amortization	Jun. 30, 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
Goodwill impairment loss	0
Contractual service agreements
Contractual service agreements, gross carrying amount							15.6	15.6
Contractual service agreements, accumulated amortization							(3.0)	(1.8)
Contractual service agreements, net carrying amount							12.6	13.8
Amortization period							6 years
Amortization expense			0.6	0.6	1.2	0.6
Amortization expense for the next five years
Future amortization expense period	5 years
Amortization expense, 2014			2.2		2.2
Amortization expense, 2015			2.2		2.2
Amortization expense, 2016			2.2		2.2
Amortization expense, 2017			2.2		2.2
Amortization expense, 2018			$ 2.2		$ 2.2