Segment Reporting (Summary Of Segment Detail) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 724.7	$ 700.0	$ 664.7	$ 644.8	$ 660.1	$ 608.2	$ 550.6	$ 553.0	$ 2,734.2	$ 2,371.9	$ 2,220.3
Depreciation and amortization									76.7	75.2	74.9
Equity earnings (loss) in unconsolidated affiliates									3.6	5.0	2.2
Earnings (loss) before income taxes									363.6	322.0	257.4
Assets	1,976.6				1,979.7				1,976.6	1,979.7	1,787.0
Equity investments in unconsolidated affiliates	21.7				19.0				21.7	19.0	18.7
Capital expenditures									97.5	65.9	72.9
Engine Products
Segment Reporting Information [Line Items]
Net sales									1,849.0	1,553.3	1,391.3
Industrial Products
Segment Reporting Information [Line Items]
Net sales									885.2	818.6	829.0
Operating Segments | Engine Products
Segment Reporting Information [Line Items]
Net sales									1,849.0	1,553.3	1,391.3
Depreciation and amortization									50.8	33.9	38.5
Equity earnings (loss) in unconsolidated affiliates									3.7	4.4	1.0
Earnings (loss) before income taxes									261.3	219.7	163.5
Assets	1,110.3				849.6				1,110.3	849.6	841.4
Equity investments in unconsolidated affiliates	17.8				14.8				17.8	14.8	14.3
Capital expenditures									64.6	29.7	37.5
Operating Segments | Industrial Products
Segment Reporting Information [Line Items]
Net sales									885.2	818.6	829.0
Depreciation and amortization									24.7	26.7	28.1
Equity earnings (loss) in unconsolidated affiliates									(0.1)	0.6	1.2
Earnings (loss) before income taxes									137.1	129.1	119.0
Assets	631.9				638.3				631.9	638.3	646.9
Equity investments in unconsolidated affiliates	3.9				4.2				3.9	4.2	4.4
Capital expenditures									31.4	23.4	27.3
Corporate and Reconciling Items
Segment Reporting Information [Line Items]
Depreciation and amortization									1.2	14.6	8.3
Earnings (loss) before income taxes									(34.8)	(26.8)	(25.1)
Assets	$ 234.4				$ 491.8				234.4	491.8	298.7
Capital expenditures									$ 1.5	$ 12.8	$ 8.1