Property, Plant and Equipment (Details) - USD ($) $ in Millions |
Dec. 31, 2025 |
Sep. 30, 2025 |
|---|---|---|
| Property, Plant and Equipment [Line Items] | ||
| Property, plant and equipment | $ 786.5 | $ 791.3 |
| Less: accumulated depreciation | (537.6) | (534.1) |
| Total Property, Plant and Equipment, Net | 248.9 | 257.2 |
| Land | ||
| Property, Plant and Equipment [Line Items] | ||
| Property, plant and equipment | 3.1 | 3.1 |
| Buildings | ||
| Property, Plant and Equipment [Line Items] | ||
| Property, plant and equipment | 121.0 | 121.0 |
| Machinery, equipment and fixtures | ||
| Property, Plant and Equipment [Line Items] | ||
| Property, plant and equipment | 592.6 | 595.4 |
| Leasehold improvements | ||
| Property, Plant and Equipment [Line Items] | ||
| Property, plant and equipment | 13.2 | 13.2 |
| Construction in progress | ||
| Property, Plant and Equipment [Line Items] | ||
| Property, plant and equipment | $ 56.6 | $ 58.6 |