Derivative Instruments And Hedging Activities (Summary Of Notional Amounts Of Outstanding Foreign Exchange Forwards) (Details) (Forward Contracts [Member]) In Millions, unless otherwise specified	Mar. 31, 2012 Euros [Member] USD ($)	Dec. 31, 2011 Euros [Member] USD ($)	Mar. 31, 2012 GBP [Member] USD ($)	Mar. 31, 2012 GBP [Member] EUR (€)	Dec. 31, 2011 GBP [Member] USD ($)	Dec. 31, 2011 GBP [Member] EUR (€)	Mar. 31, 2012 Other Foreign Currencies [Member] USD ($)	Mar. 31, 2012 Other Foreign Currencies [Member] EUR (€)	Dec. 31, 2011 Other Foreign Currencies [Member] USD ($)	Dec. 31, 2011 Other Foreign Currencies [Member] EUR (€)
Derivative [Line Items]
Contracts to purchase foreign currencies	$ 34.6	$ 27.5	$ 8.1	€ 1.1	$ 2.4	€ 1.6	$ 5.2	€ 12.3	$ 3.2	€ 13.6
Contracts to sell foreign currencies	$ 59.1	$ 47.7	$ 1.9	€ 13.2	$ 17.6	€ 7.2	$ 5.9		$ 7.6