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Pension Benefit Obligations - Equity Recognition (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
United States      
Reconciliation of amounts in consolidated statements of stockholders' equity:      
Prior service (cost) credit $ (0.8) $ (0.2) $ (0.2)
Net loss (72.5) (94.6) (129.6)
Total recognized in accumulated other comprehensive loss (73.3) (94.8) (129.8)
Foreign Pension Plan, Defined Benefit      
Reconciliation of amounts in consolidated statements of stockholders' equity:      
Prior service (cost) credit 4.1 4.4 4.4
Net loss (186.4) (263.7) (343.3)
Total recognized in accumulated other comprehensive loss $ (182.3) $ (259.3) $ (338.9)