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Fair Value Measurements - Change in Fair Value of Contingent Consideration (Detail)
$ in Millions
6 Months Ended
Dec. 31, 2017
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]  
Balance June 30, 2017 $ 140.5
Change in fair value recognized in the income statement (60.2)
Translation adjustments recognized in other comprehensive income 0.7
Ending balance December 31, 2017 $ 81.0