Derivative Instruments And Hedging Strategies (Narrative) (Details) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2011 USD ($)	Dec. 31, 2010 USD ($)	Sep. 30, 2011 Minimum [Member]	Sep. 30, 2011 Maximum [Member]	Sep. 30, 2011 Derivatives Designated As Hedging Instrument [Member] EUR (€)	Sep. 30, 2011 Derivatives Not Designated As Hedging Instruments [Member] EUR (€)
Derivatives, Fair Value [Line Items]
Number of foreign currency exchange forward contracts outstanding					142	1
Outstanding foreign currency exchange contracts to sell					€ 80.9	€ 25.9
Maturity period of foreign currency derivatives			October 31, 2011	June 30, 2013
Amount reclassified from accumulated other comprehensive income to earnings as related to forecasted revenue transactions	0.4
Maximum length of time over which hedging its exposure to the reduction in value of forecasted foreign currency cash flows through foreign currency forward contracts	June 30, 2013
Loss from accumulated other comprehensive income	$ 1.6	$ 0.2