PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Property, plant and equipment.
Gross property, plant and equipment	$ 664.8	$ 636.8
Less: Accumulated depreciation	(364.0)	(332.2)
Net property, plant and equipment	300.8	304.6
Property
Property, plant and equipment.
Gross property, plant and equipment	42.5	36.4
Plant
Property, plant and equipment.
Gross property, plant and equipment	142.2	144.3
Equipment
Property, plant and equipment.
Gross property, plant and equipment	$ 480.1	$ 456.1