Fair Value Measurements Fair Value Measurements (Pre-tax Impact of Derivatives) (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 31, 2020	Oct. 31, 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	$ (0.7)	$ 0.8
Pre-tax (gains) losses reclassified from accumulated other comprehensive income (loss) - Net investment hedges	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)	0.8	(0.7)
Pre-tax (gains) losses reclassified from accumulated other comprehensive income (loss)	0.0	1.9
Interest rate swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Pre-tax gains (losses) recognized in accumulated other comprehensive income (loss)	0.2	0.0
Pre-tax (gains) losses reclassified from accumulated other comprehensive income (loss)	$ 0.0	$ 0.0