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Segment Reporting (Summary Of Segment Detail) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jul. 31, 2016
Apr. 30, 2016
Jan. 31, 2016
Oct. 31, 2015
Jul. 31, 2015
Apr. 30, 2015
Jan. 31, 2015
Oct. 31, 2014
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2015
Segment Reporting Information [Line Items]                      
Net sales $ 660.1 $ 608.2 $ 550.6 $ 553.0 $ 593.8 $ 571.3 $ 517.2 $ 538.0 $ 2,371.9 $ 2,220.3 $ 2,371.2
Depreciation and amortization                 75.2 74.9 74.3
Equity earnings in unconsolidated affiliates                 5.0 2.2 5.1
Earnings (loss) before income taxes                 322.0 257.4 288.6
Assets 1,787.0       1,807.5       1,979.7 1,787.0 1,807.5
Equity investments in unconsolidated affiliates 18.7       18.3       19.0 18.7 18.3
Capital expenditures                 65.9 72.9 93.8
Engine Products                      
Segment Reporting Information [Line Items]                      
Net sales                 1,553.3 1,391.3 1,484.1
Industrial Products                      
Segment Reporting Information [Line Items]                      
Net sales                 818.6 829.0 887.1
Operating Segments | Engine Products                      
Segment Reporting Information [Line Items]                      
Net sales                 1,553.3 1,391.3 1,484.1
Depreciation and amortization                 33.9 38.5 43.3
Equity earnings in unconsolidated affiliates                 4.4 1.0 4.1
Earnings (loss) before income taxes                 219.7 163.5 186.3
Assets 841.4       887.7       849.6 841.4 887.7
Equity investments in unconsolidated affiliates 14.3       15.1       14.8 14.3 15.1
Capital expenditures                 29.7 37.5 54.6
Operating Segments | Industrial Products                      
Segment Reporting Information [Line Items]                      
Net sales                 818.6 829.0 887.1
Depreciation and amortization                 26.7 28.1 26.4
Equity earnings in unconsolidated affiliates                 0.6 1.2 1.0
Earnings (loss) before income taxes                 129.1 119.0 123.3
Assets 646.9       634.0       638.3 646.9 634.0
Equity investments in unconsolidated affiliates 4.4       3.2       4.2 4.4 3.2
Capital expenditures                 23.4 27.3 33.4
Corporate and Reconciling Items                      
Segment Reporting Information [Line Items]                      
Depreciation and amortization                 14.6 8.3 4.6
Earnings (loss) before income taxes                 (26.8) (25.1) (21.0)
Assets $ 298.7       $ 285.8       491.8 298.7 285.8
Capital expenditures                 $ 12.8 $ 8.1 $ 5.8