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Share-Based Compensation - Schedule of Unrecognized Share-Based Compensation Cost (Detail) - Restricted Stock Units (RSUs) [Member]
$ in Millions
Jun. 30, 2018
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized share-based compensation cost $ 34.5
Aggregate intrinsic value of options outstanding 81.6
Aggregate intrinsic value of options fully vested 81.6
Aggregate intrinsic value of RSUs outstanding $ 83.0