Fair Value Measurements (Pre-tax Impact of the Gains and Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Derivative Instruments, Gain (Loss)
Pre-tax gains (losses) recognized in accumulated other comprehensive income (loss) - Net investment hedges	$ 2.0	$ (0.8)	$ 0.0
Pre-tax (gains) losses reclassified from accumulated other comprehensive income (loss) - Net investment hedges	0.0	0.0	0.0
Forward foreign currency exchange contracts
Derivative Instruments, Gain (Loss)
Pre-tax gains (losses) recognized in accumulated other comprehensive income (loss)	(1.4)	0.2	3.2
Pre-tax (gains) losses reclassified from accumulated other comprehensive income (loss)	$ 1.0	$ 0.1	$ 0.2