Financial Instruments - Balance Sheet (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Foreign Currency Contract [Member] | Prepayments and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	$ 2.6	$ 2.6
Foreign Currency Contract [Member] | Other Non Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	0	0.1
Foreign Currency Contract [Member] | Accounts payable and accrued expenses [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability Designated as Hedging Instrument, Fair Value	1.5	2.4
Foreign Currency Contract [Member] | Other Non Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability Designated as Hedging Instrument, Fair Value	0.3	0.5
Commodity Contract [Member] | Prepayments and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	0	0
Commodity Contract [Member] | Accounts payable and accrued expenses [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability Designated as Hedging Instrument, Fair Value	0.1	0
Net Investment Hedge [Member] | Other Non Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	0	0
Net Investment Hedge [Member] | Other Non Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability Designated as Hedging Instrument, Fair Value	$ 70.0	$ 85.0