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Share Repurchase Plan (Details) (USD $)
In Millions
0 Months Ended 3 Months Ended
Jul. 18, 2011
Mar. 23, 2011
Jul. 01, 2011
Share Repurchase Plan      
Repurchase of outstanding ordinary shares, authorized, value $ 200.0 $ 200.0  
Repurchase of outstanding ordinary shares, under share repurchase plan     29.0
Cash payments on repurchase of shares, value     $ 200.0