CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2017	Jun. 30, 2016
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 2.6	$ 4.1
Common stock, authorized shares (in shares)	100,000,000	100,000,000
Common stock, issued shares (in shares)	55,349,658	55,254,569
Common stock, outstanding shares (in shares)	46,753,180	46,600,125
Common stock in treasury, shares (in shares)	8,596,478	8,654,444