Segment Reporting (Summary Of Segment Detail) (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jan. 31, 2016 |
Jan. 31, 2015 |
Jan. 31, 2016 |
Jan. 31, 2015 |
|
| Segment Reporting Information [Line Items] | ||||
| Net sales | $ 517.2 | $ 588.5 | $ 1,055.2 | $ 1,185.0 |
| Earnings Before Income Taxes | 49.4 | 65.4 | 102.8 | 142.7 |
| Operating Segments | Engine Product segment | ||||
| Segment Reporting Information [Line Items] | ||||
| Net sales | 320.9 | 357.1 | 667.5 | 747.8 |
| Earnings Before Income Taxes | 27.4 | 41.5 | 63.4 | 94.6 |
| Operating Segments | Industrial Product segment | ||||
| Segment Reporting Information [Line Items] | ||||
| Net sales | 196.3 | 231.4 | 387.7 | 437.2 |
| Earnings Before Income Taxes | 27.7 | 35.1 | 51.7 | 62.7 |
| Corporate, Non-Segment | Corporate and Unallocated | ||||
| Segment Reporting Information [Line Items] | ||||
| Earnings Before Income Taxes | $ (5.7) | $ (11.2) | $ (12.3) | $ (14.6) |