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						9 Months Ended
	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Apr. 30, 2019	Apr. 30, 2018
Earnings Per Share [Abstract]
Net earnings for basic and diluted earnings per share computation	$ 75.2	$ 60.1	$ 73.8	$ 69.9	$ (52.9)	$ 60.9	$ 209.1	$ 77.9
Weighted average common shares outstanding:
Weighted average common shares - basic (in shares)	128.2			130.1			128.5	130.5
Dilutive impact of share based awards (in shares)	1.8			1.8			1.9	2.0
Weighted average common shares - diluted (in shares)	130.0			131.9			130.4	132.5
Net earnings per share - basic (in usd per share)	$ 0.59			$ 0.54			$ 1.63	$ 0.60
Net earnings per share - diluted (in usd per share)	$ 0.58			$ 0.53			$ 1.60	$ 0.59