CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Jan. 31, 2021	Jul. 31, 2020
Statement of Financial Position [Abstract]
Accounts receivable, allowance	$ 8.3	$ 6.2
Preferred stock, par value (in usd per share)	$ 1.00	$ 1.00
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in usd per share)	$ 5.00	$ 5.00
Common stock, shares authorized (in shares)	240,000,000	240,000,000
Common stock, shares issued (in shares)	151,643,194	151,643,194
Treasury stock, shares (in shares)	25,544,032	25,304,515