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Share Repurchase Plan (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended 3 Months Ended 12 Months Ended
Jul. 22, 2011
Jul. 18, 2011
Sep. 30, 2011
Mar. 31, 2012
Share Repurchase Plan [Abstract]        
Repurchase of outstanding ordinary shares, authorized, value   $ 200.0    
Aggregate limit on share repurchases under the share repurchase plans 10.00%      
Purchase price of stock repurchased and retired during period       $ 509.8
Retired additional shares     23.5  
Stock repurchased and retired during period, shares       81.7
Shares available to be repurchased under the plans       20.4