Financial Instruments - Balance Sheet (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Foreign Exchange Contract [Member] | Prepayments and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	$ 3.0	$ 2.7
Foreign Exchange Contract [Member] | Other Non Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	0	0
Foreign Exchange Contract [Member] | Accounts payable and accrued expenses [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability Designated as Hedging Instrument, Fair Value	6.1	3.3
Foreign Exchange Contract [Member] | Other Non Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability Designated as Hedging Instrument, Fair Value	5.1	3.1
Net Investment Hedging [Member] | Other Non Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	0	0
Net Investment Hedging [Member] | Other Non Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability Designated as Hedging Instrument, Fair Value	$ 82.3	$ 75.7