Derivatives (Details 4) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Cost of Goods Sold [Member] | Commodity Futures Contracts [Member]
Amount of Loss or (Gain) Reclassified from AOCI into Income (Effective Portion):
Effective portion	$ 3.4	$ 1.1
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Other Expense [Member] | Commodity Futures Contracts [Member]
Amount of (Gain) or Loss Recognized in Income on Derivatives (Ineffective Portion):
Ineffective portion	0	0.1
Not Designated as Hedging Instrument [Member]
Amount of (Gain) or Loss Recognized in Income on Derivatives (Ineffective Portion):
Amount of (Gain) or Loss Recognized in Income on Derivatives	0.5	0.8
Not Designated as Hedging Instrument [Member] | Other Expense [Member] | Commodity Futures Contracts [Member]
Amount of (Gain) or Loss Recognized in Income on Derivatives (Ineffective Portion):
Amount of (Gain) or Loss Recognized in Income on Derivatives	0.3	0.7
Not Designated as Hedging Instrument [Member] | Other Expense [Member] | Foreign Currency Forward Contracts [Member]
Amount of (Gain) or Loss Recognized in Income on Derivatives (Ineffective Portion):
Amount of (Gain) or Loss Recognized in Income on Derivatives	$ 0.2	$ 0.1