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Supplemental Cash Flow Information - Schedule of Supplemental Cash Flow Information (Detail) - USD ($)
$ in Millions
9 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Supplemental Cash Flow Elements [Abstract]    
Cash paid during the period for income taxes $ 5.3 $ 10.4
Cash paid for interest $ 9.1 $ 2.3