Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Stockholders' Equity Note [Abstract]
Number of shares authorized to be repurchased (in shares)	13,000,000.0
Stock repurchased during the period (in shares)	1,400,000
Stock repurchased during the period	$ 65.0	$ 102.0
Shares with remaining authorization for repurchase under stock repurchase plan (in shares)	11,400,000
Dividends paid per share (in usd per share)	$ 0.420	$ 0.380