INCOME TAXES (Details 3) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Pension and postretirement benefits	$ 190.6	$ 156.8
Environmental reserves	34.5	31.9
Asset retirement obligations	13.2	15.5
Accrued liabilities	38.6	37.0
Right of use lease liabilities	90.0	0.0
Tax credits	25.1	19.5
Net operating losses	70.0	50.2
Capital loss carryforward	0.9	2.0
Interest deduction limitation	41.8	9.3
Other miscellaneous items	20.2	14.6
Total deferred tax assets	524.9	336.8
Valuation allowance	182.1	147.4	$ 121.4
Net deferred tax assets	342.8	189.4
Deferred tax liabilities:
Property, plant and equipment	525.0	541.8
Right of use lease assets	88.8	0.0
Intangible amortization	54.6	61.6
Inventory and prepaids	20.6	8.3
Partnerships	67.3	65.2
Taxes on unremitted earnings	5.7	5.1
Total deferred tax liabilities	762.0	682.0
Net deferred tax liability	$ (419.2)	$ (492.6)