Financial Instruments - Foreign currency derivatives (Details) (Foreign currency contracts [Member]) In Millions, unless otherwise specified	Dec. 31, 2012 Maturity Of Derivatives Period Three [Member] British pound EUR (€)	Dec. 31, 2011 Maturity Of Derivatives Period Three [Member] British pound EUR (€)	Dec. 31, 2012 Maturity Of Derivatives Period Three [Member] Euro USD ($)	Dec. 31, 2012 Maturity Of Derivatives Period Three [Member] Euro GBP (£)	Dec. 31, 2012 Maturity Of Derivatives Period Three [Member] Euro JPY (¥)	Dec. 31, 2012 Maturity Of Derivatives Period Three [Member] Euro PLN	Dec. 31, 2011 Maturity Of Derivatives Period Three [Member] Euro USD ($)	Dec. 31, 2011 Maturity Of Derivatives Period Three [Member] Euro GBP (£)	Dec. 31, 2011 Maturity Of Derivatives Period Three [Member] Euro JPY (¥)	Dec. 31, 2011 Maturity Of Derivatives Period Three [Member] Euro PLN	Dec. 31, 2012 Maturity Of Derivatives Period Three [Member] Japanese yen USD ($)	Dec. 31, 2011 Maturity Of Derivatives Period Three [Member] Japanese yen USD ($)	Dec. 31, 2012 Maturity Of Derivatives Period Three [Member] Korean won USD ($)	Dec. 31, 2011 Maturity Of Derivatives Period Three [Member] Korean won USD ($)	Dec. 31, 2012 Maturity Of Derivatives Period Three [Member] Mexican peso USD ($)	Dec. 31, 2011 Maturity Of Derivatives Period Three [Member] Mexican peso USD ($)	Dec. 31, 2012 Maturity Of Derivatives Period Three [Member] US dollar JPY (¥)	Dec. 31, 2011 Maturity Of Derivatives Period Three [Member] US dollar JPY (¥)	Dec. 31, 2012 Maturity Of Derivatives Period Five [Member] Korean won EUR (€)	Dec. 31, 2011 Maturity Of Derivatives Period Five [Member] Korean won EUR (€)	Dec. 31, 2012 Maturity Of Derivatives Period Two [Member] Mexican peso EUR (€)	Dec. 31, 2011 Maturity Of Derivatives Period Two [Member] Mexican peso EUR (€)	Dec. 31, 2012 Maturity Of Derivatives Period Two [Member] Swedish krona EUR (€)	Dec. 31, 2011 Maturity Of Derivatives Period Two [Member] Swedish krona EUR (€)	Dec. 31, 2012 Maturity Of Derivatives Period Two [Member] US dollar EUR (€)	Dec. 31, 2011 Maturity Of Derivatives Period Two [Member] US dollar EUR (€)	Dec. 31, 2012 Maturity Of Derivatives Period One [Member] Euro HUF	Dec. 31, 2011 Maturity Of Derivatives Period One [Member] Euro HUF	Dec. 31, 2012 Maturity Of Derivatives Period Four [Member] US dollar INR	Dec. 31, 2011 Maturity Of Derivatives Period Four [Member] US dollar INR
Derivative [Line Items]
Notional Amount of Foreign Currency Derivatives	€ 28.8	€ 64.8	$ 15.2	£ 4.7	¥ 6,760.0	87.4	$ 16.1	£ 7.0	¥ 0	24.5	$ 9.5	$ 7.4	$ 17.5	$ 2.4	$ 20.9	$ 40.7	¥ 3,000.0	¥ 3,000.0	€ 32.4	€ 34.5	€ 0	€ 9.2	€ 0	€ 6.1	€ 0	€ 3.0	9,300.0	5,400.0	111.1	0