INCOME TAXES (Details 3) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Pension and postretirement benefits	$ 92.4	$ 181.9
Environmental reserves	36.4	36.3
Asset retirement obligations	14.7	16.4
Accrued liabilities	49.4	54.1
Lease liabilities	89.7	87.4
Tax credits	40.8	49.8
Net operating losses	22.6	141.0
Capital loss carryforward	0.5	0.9
Interest deduction limitation	0.0	7.0
Total deferred tax assets	346.5	574.8
Valuation allowance	70.1	239.6	$ 182.1
Net deferred tax assets	276.4	335.2
Deferred tax liabilities:
Property, plant and equipment	496.7	530.4
Right-of-use lease assets	88.2	86.2
Intangible amortization	41.2	40.0
Inventory and prepaids	7.9	17.4
Partnerships	87.0	80.9
Taxes on unremitted earnings	8.7	6.1
Other miscellaneous items	6.3	6.2
Total deferred tax liabilities	736.0	767.2
Net deferred tax liability	$ (459.6)	$ (432.0)