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Pension Benefit Obligations - Equity Recognition (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
United States      
Reconciliation of amounts in consolidated statements of stockholders' equity:      
Prior service (cost) credit $ (0.1) $ (0.7) $ (0.8)
Net loss (133.5) (123.1) (94.8)
Total recognized in accumulated other comprehensive loss (133.6) (123.8) (95.6)
International      
Reconciliation of amounts in consolidated statements of stockholders' equity:      
Prior service (cost) credit (1.2) (1.2) 4.1
Net loss (297.8) (233.0) (186.4)
Total recognized in accumulated other comprehensive loss $ (299.0) $ (234.2) $ (182.3)