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Pension Benefit Obligations - Equity Recognition (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
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United States |  |  |
Reconciliation of amounts in consolidated statements of stockholders' equity: |  |  |
Prior service cost | $ (0.1) | $ (0.1) | $ (0.1)
Net loss | (77.6) | (77.5) | (91.7)
Total recognized in accumulated other comprehensive loss | (77.7) | (77.6) | (91.8)
International |  |  |
Reconciliation of amounts in consolidated statements of stockholders' equity: |  |  |
Prior service cost | (1.3) | (1.2) | (1.2)
Net loss | (234.9) | (207.1) | (187.1)
Total recognized in accumulated other comprehensive loss | $ (236.2) | $ (208.3) | $ (188.3)

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