Financial Instruments (Details) In Millions, unless otherwise specified	Jun. 30, 2012 Net Investment Hedge [Member] Maturity October 2019 USD ($)	Jun. 30, 2012 Net Investment Hedge [Member] Maturity October 2019 EUR (€)	Dec. 31, 2011 Net Investment Hedge [Member] Maturity October 2019 USD ($)	Dec. 31, 2011 Net Investment Hedge [Member] Maturity October 2019 EUR (€)	Jun. 30, 2012 Net Investment Hedge [Member] Maturity November 2016 USD ($)	Jun. 30, 2012 Net Investment Hedge [Member] Maturity November 2016 JPY (¥)	Dec. 31, 2011 Net Investment Hedge [Member] Maturity November 2016 USD ($)	Dec. 31, 2011 Net Investment Hedge [Member] Maturity November 2016 JPY (¥)	Jun. 30, 2012 Commodity Contract [Member] Natural Gas [Member] Maturity December 2012	Dec. 31, 2011 Commodity Contract [Member] Natural Gas [Member] Maturity December 2012
Notional Amount of Derivatives, Total [Abstract]
Notional amount of cross currency swaps	$ 75.0	€ 58.5	$ 75.0	€ 58.5	$ 150.0	¥ 17,581.5	$ 150.0	¥ 17,581.5
Commodity derivative contracts outstanding [Abstract]
Commodity volume hedged (in Metric tons/MMBTu)									180,779	0