Derivative Instruments and Hedging Activities (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Derivatives designated as hedging instruments
Derivative assets and liabilities at Fair value net	$ (0.4)	$ 0
Designated as Hedging Instrument [Member]
Derivatives designated as hedging instruments
Derivative assets and liabilities at Fair value net	(7.3)	(16.4)
Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivatives designated as hedging instruments
Derivative Assets	0	0
Derivative Liabilities	(0.2)	0
Commodity Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives designated as hedging instruments
Derivative Assets	0.4	0.2
Derivative Liabilities	(0.4)	(3.5)
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivatives designated as hedging instruments
Derivative Assets	0	0
Derivative Liabilities	(0.2)	0
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives designated as hedging instruments
Derivative Assets	0	0
Derivative Liabilities	$ (7.3)	$ (13.1)