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Supplemental Cash Flow Information - Schedule of Supplemental Cash Flow Information (Detail) - USD ($)
$ in Millions
6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]    
Cash paid during the period for income taxes $ 5.5 $ 8.0
Non-cash investing and financing activities:    
Fair value adjustment on marketable investment securities recorded to other stockholder's equity $ (0.3) $ (0.8)