INCOME TAXES (Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets
Purchase interest step-up	$ 278.1	$ 306.2
Deferred Tax Asset, Interest Expense Limitation Carry-forward	31.5	0.0
Inventory	10.5	47.0
Pension, employee benefits and compensation	60.3	55.1
Hedging	3.3	3.1
Net operating loss carry forwards	136.3	134.7
Environmental liabilities	33.6	38.1
Deferred Tax Asset, Leasing Arrangement	83.4	0.0
Other	29.2	2.7
Total deferred tax assets	666.2	586.9
Valuation allowances	0.0	0.0
Total deferred tax assets, net	666.2	586.9
Deferred tax liabilities
Property, plant and equipment	678.1	578.8
Right of use asset	83.6	0.0
Other	1.4	0.0
Total deferred tax liabilities	763.1	578.8
Net deferred tax liabilities	(96.9)
Net deferred tax assets		$ 8.1
Operating Loss Carryforwards	551.5
Internal Revenue Service (IRS) [Member]
Deferred tax liabilities
Operating Loss Carryforwards	23.1
State and Local Jurisdiction [Member]
Deferred tax liabilities
Operating Loss Carryforwards	$ 23.6