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Pension Benefit Obligations - Equity Recognition (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
United States      
Reconciliation of amounts in consolidated statements of stockholders' equity:      
Prior service cost $ (0.1) $ (0.1) $ (0.1)
Net loss (91.7) (116.5) (134.5)
Total recognized in accumulated other comprehensive loss (91.8) (116.6) (134.6)
International.      
Reconciliation of amounts in consolidated statements of stockholders' equity:      
Prior service cost (1.2) (1.6) (1.2)
Net loss (187.1) (279.5) (297.7)
Total recognized in accumulated other comprehensive loss $ (188.3) $ (281.1) $ (298.9)