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Fair Value Measurements - Change in Fair Value of Contingent Consideration (Detail)
$ in Millions
12 Months Ended
Jun. 30, 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 statement of operations (1.1)
Translation adjustments recognized in other comprehensive income 0.4
Balance June 30, 2019 $ 13.8