ACCUMULATED OTHER COMPREHENSIVE INCOME AND OTHER COMPREHENSIVE LOSS (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other comprehensive loss
Amortization of actuarial loss (gain)	$ (9.5)	$ (0.2)	$ 1.6
Other comprehensive income (loss), before income taxes	(238.1)	137.3	(4.7)
Total tax expense (benefit) for the period	(90.4)	49.1	(1.0)
Other comprehensive income (loss), net of tax	(147.7)	88.2	(3.7)
Pre-tax amount	168.6	(173.4)	13.4
Income Tax Expense (Benefit)	7.5	73.6	57.2
Cost of Goods and Services Sold	4,068.1	3,924.5	2,865.4
Other comprehensive income (loss) reclassifications
Other comprehensive loss
Other comprehensive income (loss), net of tax	(2.3)	(9.7)	1.0
Pre-tax amount	(3.7)	(15.7)	1.6
Change in foreign currency translation adjustment
Other comprehensive loss
Other comprehensive income (loss), before income taxes	(57.7)	(34.7)	8.0
Total tax expense (benefit) for the period	(22.9)	(14.7)	3.9
Other comprehensive income (loss), net of tax	(34.8)	(20.0)	4.1
Pension and OPEB liability adjustments
Other comprehensive loss
Adjustments to pension liabilities	(164.9)	189.1	(15.0)
Settlement loss (Curtailment gain)	5.8	(15.5)
Other comprehensive income (loss), before income taxes	(168.6)	173.4	(13.4)
Total tax expense (benefit) for the period	(63.1)	64.3	(5.1)
Other comprehensive income (loss), net of tax	(105.5)	109.1	(8.3)
Pension and OPEB liability adjustments | Other comprehensive income (loss) reclassifications
Other comprehensive loss
Income Tax Expense (Benefit)	(1.4)	(6.0)	0.6
Unrealized gain (loss) on derivative cash flow hedges
Other comprehensive loss
Other comprehensive income (loss), before income taxes	(11.8)	(1.4)	0.7
Total tax expense (benefit) for the period	(4.4)	(0.5)	0.2
Other comprehensive income (loss), net of tax	(7.4)	(0.9)	0.5
Unrealized gain (loss) on derivative cash flow hedges | Commodity contracts
Other comprehensive loss
Other comprehensive income (loss), before income taxes	(10.6)		0.7
Equity interest in investee's other comprehensive loss
Other comprehensive loss
Other comprehensive income (loss), before income taxes	$ (1.2)	$ (1.4)