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Pension Benefit Obligations - Equity Recognition (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
United States      
Reconciliation of amounts in consolidated statements of stockholders' equity:      
Prior service (cost) credit $ (0.7) $ (0.8) $ (0.2)
Net loss (150.7) (72.5) (94.6)
Total recognized in accumulated other comprehensive loss (151.4) (73.3) (94.8)
International      
Reconciliation of amounts in consolidated statements of stockholders' equity:      
Prior service (cost) credit (1.2) 4.1 4.4
Net loss (233.0) (186.4) (263.7)
Total recognized in accumulated other comprehensive loss $ (234.2) $ (182.3) $ (259.3)