Fair Value Measurements Fair Value Measurements (Pre-tax Impact Of Derivatives) (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pre-tax gains (losses) recognized in accumulated other comprehensive income (loss) - Net investment hedges	$ 0.8
Pre-tax (gains) losses reclassified from accumulated other comprehensive income (loss) - Net investment hedges	0.0
Forward foreign currency exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pre-tax gains (losses) recognized in accumulated other comprehensive income (loss)	(0.7)	$ 1.0
Pre-tax (gains) losses reclassified from accumulated other comprehensive income (loss)	$ 1.9	$ (0.3)