Fair Value Measurements Fair Value Measurements (Pre-tax Impact of Derivatives) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Pre-tax gains (losses) recognized in accumulated other comprehensive income (loss) - Net investment hedges	$ 4.0	$ 0.0	$ 6.2	$ 0.0
Pre-tax (gains) losses reclassified from accumulated other comprehensive income (loss) - Net investment hedges	0.0	0.0	0.0	0.0
Forward foreign currency exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Pre-tax gains (losses) recognized in accumulated other comprehensive income (loss)	(1.7)	0.1	(3.8)	1.1
Pre-tax (gains) losses reclassified from accumulated other comprehensive income (loss)	$ 3.3	$ (0.1)	$ 5.3	$ (0.4)