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Fair Value Measurements - Change in Fair Value of Contingent Consideration (Detail)
$ in Millions
9 Months Ended
Mar. 31, 2019
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]  
Balance June 30, 2018 $ 14.5
Change in fair value recognized in the income statement 1.4
Translation adjustments recognized in other comprehensive income (1.9)
Ending balance March 31, 2019 $ 14.0