INCOME TAXES (Details 3) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Pension and postretirement benefits	$ 147.3	$ 226.1
Environmental reserves	33.2	54.5
Asset retirement obligations	14.0	22.0
Accrued liabilities	37.6	53.0
Tax credits	37.1	13.2
Net operating losses	53.3	105.3
Capital loss carryforward	2.1	2.8
Other miscellaneous items	11.2	0.0
Total deferred tax assets	335.8	476.9
Valuation allowance	121.4	29.0	$ 29.3
Net deferred tax assets	214.4	447.9
Deferred tax liabilities:
Property, plant and equipment	550.3	875.5
Intangible amortization	67.3	137.3
Inventory and prepaids	1.0	13.6
Partnerships	67.5	106.3
Taxes on unremitted earnings	3.1	223.6
Other miscellaneous items	0.0	4.6
Total deferred tax liabilities	689.2	1,360.9
Net deferred tax liability	$ (474.8)	$ (913.0)