Retirement Plans (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2026 |
Mar. 31, 2025 |
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| Retirement Benefits [Abstract] | ||||
| Service cost | $ 0.5 | $ 0.6 | $ 1.0 | $ 1.2 |
| Interest cost | 4.5 | 4.5 | 9.0 | 9.0 |
| Expected return on plan assets | (5.9) | (5.3) | (11.8) | (10.7) |
| Recognized net actuarial loss | 0.7 | 0.6 | 1.4 | 1.2 |
| Net periodic (benefit) cost | $ (0.2) | $ 0.4 | $ (0.4) | $ 0.7 |
| X | ||||||||||
- References No definition available.
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount of cost recognized for passage of time related to defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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