Fair Value Measurements (Pre-tax Impact of the Gains and Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax Gains (Losses) Recognized in Accumulated Other Comprehensive income (loss):	$ (0.8)
Pre-tax (Gains) Losses Reclassified from Accumulated Other Comprehensive income (loss):	(0.1)
Pre-tax (Gains) Losses Reclassified from Accumulated Other Comprehensive income (loss):		$ 0.0	$ 0.0
Pre-tax (Gains) Losses Reclassified from Accumulated Other Comprehensive income (loss)	0.0
Forward foreign currency exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax Gains (Losses) Recognized in Accumulated Other Comprehensive income (loss):	0.2	3.2	(2.4)
Pre-tax (Gains) Losses Reclassified from Accumulated Other Comprehensive income (loss):	$ 0.1
Pre-tax (Gains) Losses Reclassified from Accumulated Other Comprehensive income (loss):		$ 0.2	$ (1.4)