CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Jul. 31, 2021	Jul. 31, 2020
Statement of Financial Position [Abstract]
Accounts receivable, allowance	$ 7.0	$ 6.2
Preferred stock (in usd per share)	$ 1.00	$ 1.00
Preferred stock (in shares)	1,000,000	1,000,000
Preferred stock (in shares)	0	0
Common stock (in usd per share)	$ 5.00	$ 5.00
Common stock (in shares)	240,000,000	240,000,000
Common stock (in shares)	151,643,194	151,643,194
Treasury stock (in shares)	26,620,560	25,304,515

Amount of allowance for credit loss on accounts receivable, classified as current.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(4)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Face amount or stated value per share of common stock.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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