Goodwill and Other Intangible Assets (Reconciliation of Intangible Assets) (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 31, 2017	Jul. 31, 2017
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets, gross	$ 106.4	$ 106.6
Finite-lived intangible assets, accumulated amortization	(67.2)	(66.0)
Amortization expense	(1.4)
Finite lived intangible assets, foreign currency translation gain (loss), gross	(0.2)
Finite lived intangible assets, foreign currency translation gain (loss)	0.2
Finite-lived intangible assets, net	$ 39.2	$ 40.6