INCOME TAXES (Details 3) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred Tax Assets
Pension and postretirement benefits	$ 42.4	$ 42.9
Environmental reserves	38.3	37.4
Asset retirement obligations	16.6	13.9
Accrued liabilities	46.1	47.4
Lease liabilities	88.1	91.4
Tax credits	47.3	37.4
Net operating losses (NOL)	54.1	23.2
Deferred Tax Assets, Other	3.0	2.7
Total deferred tax assets	335.9	296.3
Valuation allowance	99.5	76.4	$ 70.1
Net deferred tax assets	236.4	219.9
Deferred Tax Liabilities
Property, plant and equipment	439.5	481.7
Right-of-use lease assets	86.5	89.8
Intangible amortization	76.9	68.7
Inventory and prepaids	5.5	12.1
Taxes on unremitted earnings	16.8	12.0
Other miscellaneous items	0.0	2.4
Total deferred tax liabilities	625.2	666.7
Net deferred income tax liability	$ (388.8)	$ (446.8)