INCOME TAXES (Details 3) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets [Abstract]
Pension and postretirement benefits	$ 226.1	$ 235.2
Environmental reserves	54.5	55.3
Asset retirement obligations	22.0	21.0
Accrued liabilities	53.0	53.7
Tax credits	13.2	23.3
Federal and state net operating losses	105.3	40.1
Capital loss carryforward	2.8	4.7
Other miscellaneous items	0.0	18.5
Total deferred tax assets	476.9	451.8
Valuation allowance	29.0	29.3	$ 16.6
Net deferred tax assets	447.9	422.5
Deferred tax liabilities [Abstract]
Property, plant and equipment	875.5	875.6
Intangible amortization	137.3	138.4
Deferred Tax Liabilities, Inventory	13.6	11.6
Deferred Tax Liabilities, Partnerships	106.3	101.4
Deferred Tax Liabilities, Undistributed Foreign Earnings	223.6	294.8
Other miscellaneous items	4.6	0.0
Deferred Tax Liabilities, Gross	1,360.9	1,421.8
Total deferred tax liabilities	$ (913.0)	$ (999.3)