ACQUISITION (Details 2) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Oct. 05, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill	$ 2,118.0	$ 2,174.1		$ 747.1
DCP Business
Business Acquisition [Line Items]
Total current assets			$ 883.7
Property, plant and equipment			3,079.1
Deferred tax assets			85.0
Intangible assets			612.6
Other assets			438.9
Total assets acquired			5,099.3
Total current liabilities			359.9
Long-term debt			517.9
Accrued pension liability			442.3
Deferred tax liabilities			1,017.7
Other liabilities			8.6
Total liabilities assumed			2,346.4
Net identifiable assets acquired			2,752.9
Goodwill			1,372.5
Fair value of net assets acquired			4,125.4
Initial Valuation [Member] | DCP Business
Business Acquisition [Line Items]
Total current assets			921.7
Property, plant and equipment			3,090.8
Deferred tax assets			76.8
Intangible assets			582.3
Other assets			426.5
Total assets acquired			5,098.1
Total current liabilities			357.6
Long-term debt			517.9
Accrued pension liability			447.1
Deferred tax liabilities			1,054.9
Other liabilities			2.0
Total liabilities assumed			2,379.5
Net identifiable assets acquired			2,718.6
Goodwill			1,427.5
Fair value of net assets acquired			4,146.1
Measurement Period Adjustments [Member] | DCP Business
Business Acquisition [Line Items]
Total current assets			(38.0)
Property, plant and equipment			(11.7)
Deferred tax assets			8.2
Intangible assets			30.3
Other assets			12.4
Total assets acquired			1.2
Total current liabilities			2.3
Long-term debt			0.0
Accrued pension liability			(4.8)
Deferred tax liabilities			(37.2)
Other liabilities			6.6
Total liabilities assumed			(33.1)
Net identifiable assets acquired			34.3
Goodwill			(55.0)
Fair value of net assets acquired			$ (20.7)