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Stockholders' Equity - Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance at beginning of period | $ 185.6 | $ 203.2
Other comprehensive loss before reclassification | (3.0) | (10.4)
(Gain) loss reclassified out of accumulated other comprehensive income | (2.1) | 4.6
Tax benefit | 0.4 | 2.5
Balance at end of period | 338.5 | 185.6
Unamortized benefit plan credits |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance at beginning of period | 11.7 | 13.4
Other comprehensive loss before reclassification | 0.0 | 0.0
(Gain) loss reclassified out of accumulated other comprehensive income | (2.1) | (2.1)
Tax benefit | 0.4 | 0.4
Balance at end of period | 10.0 | 11.7
Currency translation adjustments |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance at beginning of period | (1.8) | (6.0)
Other comprehensive loss before reclassification | (3.0) | (0.4)
(Gain) loss reclassified out of accumulated other comprehensive income | 0.0 | 4.4
Tax benefit | 0.0 | 0.2
Balance at end of period | (4.8) | (1.8)
Change in fair value of cash flow hedges |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance at beginning of period | 0.0 | 5.8
Other comprehensive loss before reclassification | 0.0 | (10.0)
(Gain) loss reclassified out of accumulated other comprehensive income | 0.0 | 2.3
Tax benefit | 0.0 | 1.9
Balance at end of period | 0.0 | 0.0
Accumulated other comprehensive income |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance at beginning of period | 9.9 | 13.2
Balance at end of period | $ 5.2 | $ 9.9

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