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Stockholders' Equity - Schedule of Reclassifications From Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amortization of pension and other postretirement plan prior service credits | $ 23.6 | $ 11.7 | $ (27.6)
Business disposal | 4.1 | 3.0 | (1,220.3)
Income tax expense (benefit) | 77.5 | 69.1 | 37.1
Discontinued Operations, Held-for-sale |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Business disposal | 4.1 | 3.0 | (1,220.3)
Income tax expense (benefit) | 2.9 | (11.1) | 432.6
Currency translation adjustment loss | 4.4 | 30.7 |
Net periodic benefit costs (income) |  |  | (0.1)
Reclassification out of Accumulated Other Comprehensive Income |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amortization of pension and other postretirement plan prior service credits | (2.1) | (2.1) | (2.1)
Business disposal | 0.0 | 4.4 | 30.6
Loss (gain) on cash flow hedges | 0.0 | 2.3 | 12.7
Income tax expense (benefit) | 0.4 | 2.5 | 3.0
Other comprehensive income (loss), net of tax | $ (1.7) | $ 7.1 | $ 44.2

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