Derivatives (Locations and Amounts of Derivative Fair Values) (Details) - Fair Value, Inputs, Level 2 [Member] - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total Assets	$ 11.1	$ 0.0
Total Liabilities	0.8	13.3
Designated as Hedging Instrument [Member] | Commodity Futures Contracts [Member] | Current Assets [Member]
Derivatives, Fair Value [Line Items]
Total Assets	8.7	0.0
Designated as Hedging Instrument [Member] | Commodity Futures Contracts [Member] | Non-Current Assets [Member]
Derivatives, Fair Value [Line Items]
Total Assets	1.9	0.0
Designated as Hedging Instrument [Member] | Commodity Futures Contracts [Member] | Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Total Liabilities	0.0	12.5
Designated as Hedging Instrument [Member] | Commodity Futures Contracts [Member] | Non-Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Total Liabilities	0.0	0.4
Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Current Assets [Member]
Derivatives, Fair Value [Line Items]
Total Assets	0.5	0.0
Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Non-Current Assets [Member]
Derivatives, Fair Value [Line Items]
Total Assets	0.0	0.0
Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Total Liabilities	0.8	0.4
Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Non-Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Total Assets	0.0	0.0
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total Assets	1.1	0.2
Total Liabilities	3.2	1.5
Not Designated as Hedging Instrument [Member] | Commodity Futures Contracts [Member] | Current Assets [Member]
Derivatives, Fair Value [Line Items]
Total Assets	0.7	0.0
Not Designated as Hedging Instrument [Member] | Commodity Futures Contracts [Member] | Non-Current Assets [Member]
Derivatives, Fair Value [Line Items]
Total Assets	0.2	0.0
Not Designated as Hedging Instrument [Member] | Commodity Futures Contracts [Member] | Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Total Liabilities	0.0	1.5
Not Designated as Hedging Instrument [Member] | Commodity Futures Contracts [Member] | Non-Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Total Liabilities	0.0	0.0
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Current Assets [Member]
Derivatives, Fair Value [Line Items]
Total Assets	0.2	0.2
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Non-Current Assets [Member]
Derivatives, Fair Value [Line Items]
Total Assets	0.0	0.0
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Total Liabilities	3.2	0.0
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Non-Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Total Assets	$ 0.0	$ 0.0