Derivative Instruments And Hedging Activities (Summary Of Notional Amounts Of Outstanding Foreign Exchange Forwards) (Details) (Forward Contracts [Member]) In Millions	Sep. 30, 2011 Euros [Member] USD ($)	Dec. 31, 2010 Euros [Member] USD ($)	Sep. 30, 2011 GBP [Member] USD ($)	Sep. 30, 2011 GBP [Member] EUR (€)	Dec. 31, 2010 GBP [Member] USD ($)	Dec. 31, 2010 GBP [Member] EUR (€)	Sep. 30, 2011 Other Foreign Currencies [Member] USD ($)	Sep. 30, 2011 Other Foreign Currencies [Member] EUR (€)	Dec. 31, 2010 Other Foreign Currencies [Member] USD ($)	Dec. 31, 2010 Other Foreign Currencies [Member] EUR (€)
Derivative [Line Items]
Contracts to purchase foreign currencies	$ 12.6	$ 11.7	$ 4.1	€ 5.4			$ 6.1	€ 10.8	$ 5.4	€ 10.5
Contracts to sell foreign currencies	$ 54.1	$ 55.5	$ 19.6	€ 15.5	$ 20.7	€ 14.0	$ 7.3		$ 19.5

Aggregate notional amount of foreign currency derivatives to purchase a foreign currency. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant