Derivative Instruments and Hedging Activities Derivative instruments fair value (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	$ (0.2)	$ (16.4)
Designated as Hedging Instrument [Member] | Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets	0.3	0.2
Derivative Liabilities	0	(3.5)
Designated as Hedging Instrument [Member] | Currency [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets	0.2	0
Derivative Liabilities	(0.7)	(13.1)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	0	0
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets	0.1	0
Derivative Liabilities	0	0
Not Designated as Hedging Instrument [Member] | Currency [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets	0.1	0
Derivative Liabilities	$ (0.2)	$ 0