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Supplemental Cash Flow Information (Tables)
9 Months Ended
Mar. 31, 2016
Supplemental Cash Flow Elements [Abstract]  
Schedule of Supplemental Cash Flow Information
     Nine months ended
March 31,
 
     2016      2015  

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