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Supplemental Cash Flow Information - Schedule of Supplemental Cash Flow Information (Detail) - USD ($)
$ in Millions
9 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Supplemental Cash Flow Elements [Abstract]    
Cash paid during the period for income taxes $ 28.5 $ 22.7
Non-cash investing and financing activities:    
Fair value adjustment on marketable investment securities recorded to stockholders' equity $ 0.2 $ (0.3)