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Fair Value Measurements - Change in Fair Value of Contingent Consideration (Detail)
$ in Millions
3 Months Ended
Sep. 30, 2018
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 0.4
Ending balance September 30, 2018 $ 14.9