Segment Information (Depreciation and Amortization and Capital Expenditures by Reportable Segment) (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
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| Segment Reporting [Line Items] | ||||
| Depreciation and amortization | $ 12.6 | $ 11.7 | $ 37.1 | $ 34.1 |
| Segment Reporting, Long-Lived Asset, Expenditure for Addition | 11.7 | 11.7 | 43.6 | 32.8 |
| Capital expenditures | 43.6 | 32.8 | ||
| Other Operating Segment | Water Flow Solutions | ||||
| Segment Reporting [Line Items] | ||||
| Depreciation and amortization | 7.5 | 6.6 | 21.8 | 19.0 |
| Segment Reporting, Long-Lived Asset, Expenditure for Addition | 6.9 | 5.3 | 18.3 | 15.8 |
| Other Operating Segment | Water Management Solutions | ||||
| Segment Reporting [Line Items] | ||||
| Depreciation and amortization | 5.1 | 5.0 | 15.2 | 15.0 |
| Segment Reporting, Long-Lived Asset, Expenditure for Addition | 4.8 | 6.4 | 25.3 | 17.0 |
| Corporate | ||||
| Segment Reporting [Line Items] | ||||
| Depreciation and amortization | $ 0.0 | $ 0.1 | $ 0.1 | $ 0.1 |
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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of expenditure for addition to long-lived asset included in determination of segment asset by chief operating decision maker (CODM) or otherwise regularly provided to CODM. Long-lived asset excludes financial instrument, long-term customer relationship of financial institution, mortgage and other servicing rights, deferred policy acquisition cost, and deferred tax asset. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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