Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Income Tax Disclosure [Abstract]
Statutory U.S. federal rate (percentage)	21.00%	26.90%	35.00%
Finalized discrete tax charge on repatriated earnings	$ 111.9
Discrete tax charge on repatriated earnings		$ 94.5
Tax charge related to dividends	17.2
Net tax charge	0.3
Transition tax not due within 12 months	93.8
TCJA tax benefit	1.2
TCJA tax benefit related to dividends	2.2
Total dividends received deduction benefit	3.4
Undistributed earnings	1,200.0
Undistributed earnings not considered reinvested	930.0
Undistributed earnings tax charge	6.4
Undistributed earnings considered reinvested	280.0
Interest expense recognized	0.5
Gross accrued interest and penalties	1.6	$ 1.7
Unrecognized tax benefits	$ 1.7