Segment Reporting (Summary of Segment Detail) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Segment Reporting Information
Net sales	$ 765.0	$ 629.7	$ 2,080.8	$ 1,964.4
Earnings before income taxes	110.9	84.4	267.0	253.9
Operating Segments | Engine Products segment
Segment Reporting Information
Net sales	531.0	420.4	1,429.6	1,315.2
Earnings before income taxes	84.4	56.5	206.1	172.2
Operating Segments | Engine Products segment | Off-Road
Segment Reporting Information
Net sales	95.7	63.5	238.4	199.6
Operating Segments | Engine Products segment | On-Road
Segment Reporting Information
Net sales	39.7	25.1	105.0	99.5
Operating Segments | Engine Products segment | Aftermarket
Segment Reporting Information
Net sales	371.4	301.9	1,018.7	929.4
Operating Segments | Engine Products segment | Aerospace and Defense
Segment Reporting Information
Net sales	24.2	29.9	67.5	86.7
Operating Segments | Industrial Products segment
Segment Reporting Information
Net sales	234.0	209.3	651.2	649.2
Earnings before income taxes	37.6	34.7	90.9	98.8
Operating Segments | Industrial Products segment | Industrial Filtration Solutions
Segment Reporting Information
Net sales	163.7	137.4	449.3	441.4
Operating Segments | Industrial Products segment | Gas Turbine Systems
Segment Reporting Information
Net sales	25.5	29.2	71.9	74.2
Operating Segments | Industrial Products segment | Special Applications
Segment Reporting Information
Net sales	44.8	42.7	130.0	133.6
Corporate and unallocated
Segment Reporting Information
Earnings before income taxes	$ (11.1)	$ (6.8)	$ (30.0)	$ (17.1)