Earnings Per Share (Information Necessary to Calculate Basic and Diluted Net Earnings Per Common Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Earnings Per Share [Abstract]
Net earnings for basic and diluted earnings per share computation	$ 61.9	$ 65.0
Weighted average common shares outstanding:
Weighted average common shares - basic (in shares)	126.8	126.9
Dilutive impact of share-based awards (in shares)	1.2	1.7
Weighted average common shares - diluted (in shares)	128.0	128.6
Net earnings per share - basic (in usd per share)	$ 0.49	$ 0.51
Net earnings per share - diluted (in usd per share)	$ 0.48	$ 0.51