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, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Earnings Per Share [Abstract]
Net earnings for basic and diluted earnings per share computation	$ 64.4	$ 60.1	$ 129.5	$ 133.9
Weighted average common shares outstanding:
Weighted average common shares - basic (in shares)	127.1	128.3	127.0	128.6
Dilutive impact of share based awards (in shares)	1.8	1.7	1.8	2.0
Weighted average common shares - diluted (in shares)	128.9	130.0	128.8	130.6
Net earnings per share - basic (in usd per share)	$ 0.51	$ 0.47	$ 1.02	$ 1.04
Net earnings per share - diluted (in usd per share)	$ 0.50	$ 0.46	$ 1.01	$ 1.03