Derivatives (Details 3) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Commodity Futures Contracts [Member] | Designated as Hedging Instrument [Member] | Other Assets Current [Member]
Location and amounts of derivative fair values in Consolidated Balance Sheets and derivative gains and losses in Consolidated Statements of Operations
Derivative Asset, Fair Value	$ 0	$ 17.4
Commodity Futures Contracts [Member] | Designated as Hedging Instrument [Member] | Other Assets Non Current [Member]
Location and amounts of derivative fair values in Consolidated Balance Sheets and derivative gains and losses in Consolidated Statements of Operations
Derivative Asset, Fair Value	0	1.3
Commodity Futures Contracts [Member] | Designated as Hedging Instrument [Member] | Other Liabilities Current [Member]
Location and amounts of derivative fair values in Consolidated Balance Sheets and derivative gains and losses in Consolidated Statements of Operations
Derivative Liability, Fair Value	13.9
Commodity Futures Contracts [Member] | Designated as Hedging Instrument [Member] | Other Liabilities Non Current [Member]
Location and amounts of derivative fair values in Consolidated Balance Sheets and derivative gains and losses in Consolidated Statements of Operations
Derivative Liability, Fair Value	1.8
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Liabilities Current [Member]
Location and amounts of derivative fair values in Consolidated Balance Sheets and derivative gains and losses in Consolidated Statements of Operations
Derivative Liability, Fair Value	2.1	2.2
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Liabilities Non Current [Member]
Location and amounts of derivative fair values in Consolidated Balance Sheets and derivative gains and losses in Consolidated Statements of Operations
Derivative Liability, Fair Value	0.2	1.4
Designated as Hedging Instrument [Member]
Location and amounts of derivative fair values in Consolidated Balance Sheets and derivative gains and losses in Consolidated Statements of Operations
Derivative Asset, Fair Value	0	18.7
Derivative Liability, Fair Value	18.0	3.6
Designated as Hedging Instrument [Member] | Foreign Currency Froward Contracts [Member] | Other Assets Current [Member]
Location and amounts of derivative fair values in Consolidated Balance Sheets and derivative gains and losses in Consolidated Statements of Operations
Derivative Asset, Fair Value	0	0
Designated as Hedging Instrument [Member] | Foreign Currency Froward Contracts [Member] | Other Liabilities Current [Member]
Location and amounts of derivative fair values in Consolidated Balance Sheets and derivative gains and losses in Consolidated Statements of Operations
Derivative Liability, Fair Value	0	0
Commodity Futures Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Assets Current [Member]
Location and amounts of derivative fair values in Consolidated Balance Sheets and derivative gains and losses in Consolidated Statements of Operations
Derivative Asset, Fair Value	0	1.4
Commodity Futures Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Assets Non Current [Member]
Location and amounts of derivative fair values in Consolidated Balance Sheets and derivative gains and losses in Consolidated Statements of Operations
Derivative Asset, Fair Value	0	0.1
Commodity Futures Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities Current [Member]
Location and amounts of derivative fair values in Consolidated Balance Sheets and derivative gains and losses in Consolidated Statements of Operations
Derivative Liability, Fair Value	2.9
Commodity Futures Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities Non Current [Member]
Location and amounts of derivative fair values in Consolidated Balance Sheets and derivative gains and losses in Consolidated Statements of Operations
Derivative Liability, Fair Value	0.2
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities Current [Member]
Location and amounts of derivative fair values in Consolidated Balance Sheets and derivative gains and losses in Consolidated Statements of Operations
Derivative Liability, Fair Value	0	0
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities Non Current [Member]
Location and amounts of derivative fair values in Consolidated Balance Sheets and derivative gains and losses in Consolidated Statements of Operations
Derivative Liability, Fair Value	0	0
Not Designated as Hedging Instrument [Member]
Location and amounts of derivative fair values in Consolidated Balance Sheets and derivative gains and losses in Consolidated Statements of Operations
Derivative Asset, Fair Value	0.5	1.7
Derivative Liability, Fair Value	3.2	0
Not Designated as Hedging Instrument [Member] | Foreign Currency Froward Contracts [Member] | Other Assets Current [Member]
Location and amounts of derivative fair values in Consolidated Balance Sheets and derivative gains and losses in Consolidated Statements of Operations
Derivative Asset, Fair Value	0.5	0.2
Not Designated as Hedging Instrument [Member] | Foreign Currency Froward Contracts [Member] | Other Liabilities Current [Member]
Location and amounts of derivative fair values in Consolidated Balance Sheets and derivative gains and losses in Consolidated Statements of Operations
Derivative Liability, Fair Value	$ 0.1	$ 0