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Stock Compensation Plan (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2022
Shares issued for stock based compensation (in shares)	4,400,000
Stock based compensation award vesting period	3 years
Stock based compensation, shares available for grant (in shares)	2,800,000
Total unrecognized compensation expense	$ 28.2
Share-based Payment Arrangement, Exercise of Option, Tax Benefit	$ 24.0	$ 12.3	$ 16.3
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Stock Appreciation Rights (SARs) [Member]
Weighted-average grant-date fair value (in dollars per share)	$ 52.30	$ 58.25	$ 98.19
Intrinsic value of options and SARs exercised	$ 82.0	$ 35.0	$ 41.2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares	96,000	91,000	131,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	$ 0.1	$ 2.6	$ 15.2
Restricted Stock Units (RSUs) [Member]
Weighted-average grant-date fair value (in dollars per share)	$ 222.17	$ 217.46	$ 264.44
Stock based compensation, restricted shares granted (in shares)	94,000	83,000	68,000
Stock based compensation, restricted shares vested (in shares)	66,000	63,000	102,000
Stock based compensation, total fair value of restricted shares	$ 15.0	$ 14.8	$ 28.8
Expected to be Recognized in One Year [Member] \| Forecast [Member]
Total unrecognized compensation expense				$ 1.4	$ 9.7	$ 17.1