Financial Instruments and Hedging Activities, Concentrations of Credit Risk and Fair Value of Financial Instruments (Details 1) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
U. S. dollar equivalent contractual amounts of Cooper's forward exchange contracts
Total Contractual amounts of forward exchange contracts	$ 1,168.2	$ 1,777.0
United States of America, Dollars [Member]
U. S. dollar equivalent contractual amounts of Cooper's forward exchange contracts
Total Contractual amounts of forward exchange contracts	579.4	894.8
Euro Member Countries, Euro [Member]
U. S. dollar equivalent contractual amounts of Cooper's forward exchange contracts
Total Contractual amounts of forward exchange contracts	411.7	335.4
United Kingdom, Pounds [Member]
U. S. dollar equivalent contractual amounts of Cooper's forward exchange contracts
Total Contractual amounts of forward exchange contracts	153.2	143.9
Canada, Dollars [Member]
U. S. dollar equivalent contractual amounts of Cooper's forward exchange contracts
Total Contractual amounts of forward exchange contracts	0	370.6
Other Currencies [Member]
U. S. dollar equivalent contractual amounts of Cooper's forward exchange contracts
Total Contractual amounts of forward exchange contracts	$ 23.9	$ 32.3