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Fair Value - Changes in Fair Value of Level 3 Contingent Consideration Liability (Detail)
$ in Millions
3 Months Ended
Sep. 30, 2015
USD ($)
Fair Value Disclosures [Abstract]  
Beginning balance $ 44.2
Cash settlement of contingent consideration liability (9.6)
Accretion and remeasurement 2.7
Ending balance $ 37.3