CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2021	Jun. 30, 2020
Current assets:
Allowance for doubtful accounts	$ 6.5	$ 4.6
STOCKHOLDERS' EQUITY
Common stock, authorized shares (in shares)	100,000,000	100,000,000
Common stock, issued shares (in shares)	56,024,619	56,012,748
Common stock, outstanding shares (in shares)	48,040,676	47,850,468
Common stock in treasury, shares (in shares)	7,983,943	8,162,280