CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2016	Jun. 30, 2015
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 4.1	$ 3.8
Common stock, authorized shares (in shares)	100,000,000	100,000,000
Common stock, issued shares (in shares)	55,254,569	55,234,942
Common stock, outstanding shares (in shares)	46,600,125	50,318,244
Common stock in treasury, shares (in shares)	8,654,444	4,916,698