Commitments And Contingencies (Details) In Millions, unless otherwise specified	0 Months Ended		1 Months Ended		3 Months Ended
	Mar. 31, 2012 USD ($)	Mar. 31, 2012 BRL	Apr. 30, 2012 USD ($)	Apr. 30, 2012 BRL	Mar. 31, 2012 USD ($)	Mar. 31, 2012 BRL	Feb. 18, 2011	Apr. 20, 2010 USD ($)
Commitments And Contingencies [Abstract]
Number of class action lawsuits					9	9
Number of other lawsuits					10	10
Number of claims made							100,000
General liability coverage								$ 100
Value of Brazilian subsidiary served with assessments					13.4	24.4
Reduction of assessments due to errors	4.6	8.4
Amount of interest, penalties and monetary restatement fees on tax assessment			$ 10.8	19.7