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Supplemental Cash Flow Information - Schedule of Supplemental Cash Flow Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Supplemental Cash Flow Elements [Abstract]    
Cash paid during the period for income taxes $ 4.9 $ 5.2
Cash paid for interest $ (0.9) $ (1.0)