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Goodwill (Narrative) (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Sep. 30, 2017
Goodwill [Line Items]    
Goodwill, accumulated impairment losses $ 442.0 $ 417.2
Industrial Gases - Americas    
Goodwill [Line Items]    
Goodwill, accumulated impairment losses $ 442.0