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		6 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Earnings Per Share [Abstract]
Net earnings	$ 56.2	$ 64.4	$ 118.1	$ 129.5
Weighted average common shares outstanding:
Weighted average common shares - basic (in shares)	126.6	127.1	126.7	127.0
Dilutive impact of share-based awards (in shares)	1.6	1.8	1.5	1.8
Weighted average common shares - diluted (in shares)	128.2	128.9	128.2	128.8
Net earnings per share - basic (in usd per share)	$ 0.44	$ 0.51	$ 0.93	$ 1.02
Net earnings per share - diluted (in usd per share)	$ 0.44	$ 0.50	$ 0.92	$ 1.01
Stock options excluded from net earnings per share calculation (in shares)	0.8	0.8	0.9	0.8