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Fair Value - Changes in Fair Value of Level 3 Contingent Consideration Liability (Detail)
$ in Millions
9 Months Ended
Mar. 31, 2016
USD ($)
Fair Value Disclosures [Abstract]  
Beginning balance $ 44.2
Cash settlement of contingent consideration liability (18.2)
Accretion and remeasurement (0.5)
Ending balance $ 25.5