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Fair Value Measurements - Change in Fair Value of Contingent Consideration (Detail)
$ in Millions
9 Months Ended
Mar. 31, 2018
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 (61.3)
Payment of contingent consideration (63.2)
Translation adjustments recognized in other comprehensive income 1.0
Ending balance March 31, 2018 $ 17.0