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Supplemental Cash Flow Information - Schedule of Supplemental Cash Flow Information (Detail) - USD ($)
$ in Millions
9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Supplemental Cash Flow Elements [Abstract]    
Cash paid during the period for income taxes $ 10.4 $ 8.5
Non-cash investing and financing activities:    
Fair value adjustment on marketable investment securities recorded to other stockholder's equity $ (0.5) $ (0.5)