Goodwill and Other Intangible Assets (Reconciliation Of Goodwill) (Details) $ in Millions	3 Months Ended
	Oct. 31, 2016 USD ($)
Goodwill [Roll Forward]
Balance as of July 31, 2016	$ 229.3
Goodwill acquired	0.4
Foreign exchange translation	(1.0)
Balance as of October 31, 2016	228.7
Operating Segments | Engine Products
Goodwill [Roll Forward]
Balance as of July 31, 2016	77.3
Goodwill acquired	0.4
Foreign exchange translation	0.0
Balance as of October 31, 2016	77.7
Operating Segments | Industrial Products segment
Goodwill [Roll Forward]
Balance as of July 31, 2016	152.0
Goodwill acquired	0.0
Foreign exchange translation	(1.0)
Balance as of October 31, 2016	$ 151.0