Supplemental Financial Statement Information (Supplemental Statement of Income Information) (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Financial Statement Related Disclosures [Abstract] | ||||
| Interest income | $ (1.1) | $ (0.2) | $ (4.3) | $ (2.0) |
| Foreign currency exchange gain (loss) | 1.2 | 2.0 | 4.3 | (1.4) |
| Pension cost other than service costs and settlement loss | 0.1 | 0.0 | 0.8 | 0.0 |
| Settlement loss on U.K. pension plan termination | 0.2 | 0.0 | 26.3 | 0.0 |
| Total Other items, net | $ 0.2 | $ 1.9 | $ 26.9 | $ (3.3) |
| X | ||||||||||
- Definition Defined Benefit Plan, Gain (Loss) No definition available.
|
| X | ||||||||||
- Definition Financial Statement Related Disclosures [Abstract] No definition available.
|
| X | ||||||||||
- Definition Settlement Gain (Loss) On Pension Plan Termination No definition available.
|
| X | ||||||||||
- Definition Amount, before tax, of realized and unrealized gain (loss) from foreign currency transaction. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of interest income earned from interest bearing assets classified as other. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|