Derivatives (Details 3) (Fair Value, Inputs, Level 2 [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	$ 0.4	[1]	$ 1.9	[1]
Derivative Liability, Fair Value	1.2	[1]	0	[1]
Designated as Hedging Instrument [Member] | Commodity Futures Contracts [Member] | Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	0.1	[1]	1.6	[1]
Designated as Hedging Instrument [Member] | Commodity Futures Contracts [Member] | Non-Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	0.3	[1]	0.3	[1]
Designated as Hedging Instrument [Member] | Commodity Futures Contracts [Member] | Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	1.2	[1]	0	[1]
Designated as Hedging Instrument [Member] | Commodity Futures Contracts [Member] | Non-Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	0	[1]	0	[1]
Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	0	[1]	0	[1]
Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	0	[1]	0	[1]
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	0.1	[1]	0.3	[1]
Derivative Liability, Fair Value	0.3	[1]	0.1	[1]
Not Designated as Hedging Instrument [Member] | Commodity Futures Contracts [Member] | Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	0	[1]	0.2	[1]
Not Designated as Hedging Instrument [Member] | Commodity Futures Contracts [Member] | Non-Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	0	[1]	0	[1]
Not Designated as Hedging Instrument [Member] | Commodity Futures Contracts [Member] | Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	0.3	[1]	0	[1]
Not Designated as Hedging Instrument [Member] | Commodity Futures Contracts [Member] | Non-Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	0	[1]	0	[1]
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	0.1	[1]	0.1	[1]
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	$ 0	[1]	$ 0.1	[1]

[1] All derivative instruments are classified as Level 2 within the fair value hierarchy. See Note 20 for more information on fair value measurements.