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Affiliated Companies (Tables)
12 Months Ended
Dec. 31, 2012
Equity Method Investments and Joint Ventures [Abstract]  
Schedule of Equity Method Investments
At December 31, 2012, the following affiliated companies were accounted for under the equity method:

 
Location
Ownership interest
The West Company Mexico, S.A. de C.V.
Mexico
49%
Aluplast S.A. de C.V.
Mexico
49%
Pharma Tap S.A. de C.V.
Mexico
49%
Pharma Rubber S.A. de C.V.
Mexico
49%
Daikyo Seiko, Ltd.
Japan
25%