Financial Instruments (Details) (Net investment hedge contracts) In Millions, unless otherwise specified	Jun. 30, 2013 Maturity October 2019 USD ($)	Jun. 30, 2013 Maturity October 2019 EUR (€)	Dec. 31, 2012 Maturity October 2019 USD ($)	Dec. 31, 2012 Maturity October 2019 EUR (€)	Jun. 30, 2013 Maturity November 2016 USD ($)	Jun. 30, 2013 Maturity November 2016 JPY (¥)	Dec. 31, 2012 Maturity November 2016 USD ($)	Dec. 31, 2012 Maturity November 2016 JPY (¥)
Derivative [Line Items]
Notional amount of derivative	$ 75.0	€ 58.5	$ 75.0	€ 58.5	$ 150.0	¥ 17,581.5	$ 150.0	¥ 17,581.5