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Summary of Major Classes of Consideration Transferred (Detail) (USD $)
In Millions, unless otherwise specified
0 Months Ended
Oct. 01, 2013
Business Acquisition [Line Items]  
Equity instruments (28.7 million ordinary shares) $ 127.3us-gaap_StockIssuedDuringPeriodValueAcquisitions
Cash 135.0us-gaap_PaymentsToAcquireBusinessesGross
Total consideration $ 262.3us-gaap_BusinessCombinationConsiderationTransferred1