INCOME TAXES (Details 3) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets [Abstract]
Pension and postretirement benefits	$ 74.6	$ 93.3
Environmental reserves	60.2	60.5
Asset retirement obligations	25.7	28.6
Accrued liabilities	48.2	43.1
Tax credits	13.3	10.8
Federal and state net operating losses	7.2	6.7
Capital loss carryforward	3.0	15.5
Other miscellaneous items	10.7	5.3
Total deferred tax assets	242.9	263.8
Valuation allowance	(13.4)	(21.1)
Net deferred tax assets	229.5	242.7
Deferred tax liabilities [Abstract]
Property, plant and equipment	182.5	178.9
Intangible amortization	8.4	8.8
Inventory and prepaids	3.1	0
Partnerships	93.7	95.0
Total deferred tax liabilities	287.7	282.7
Net deferred tax (liability) asset	$ (58.2)	$ (40.0)