PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, plant and equipment, net [Abstract]
Property, plant and equipment, Gross	$ 91.5	$ 148.2
Less accumulated depreciation and amortization	62.0	109.9
Property, plant and equipment, net	29.5	38.3
Assets under capital leases, included in property, plant and equipment [Abstract]
Office, computer and other equipment	6.0	17.5
Less: Accumulated amortization	5.5	16.3
Property, plant and equipment, assets under capital leases, net	0.5	1.2
Depreciation	7.4	11.1	$ 15.4
NATG [Member]
Assets under capital leases, included in property, plant and equipment [Abstract]
Depreciation	0.6	3.1	$ 8.5
Land and Buildings [Member]
Property, plant and equipment, net [Abstract]
Property, plant and equipment, Gross	14.9	17.7
Furniture and Fixtures, Office, Computer and Other Equipment and Software [Member]
Property, plant and equipment, net [Abstract]
Property, plant and equipment, Gross	58.2	108.7
Leasehold Improvements [Member]
Property, plant and equipment, net [Abstract]
Property, plant and equipment, Gross	$ 18.4	$ 21.8