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Goodwill (Schedule of Goodwill by Segment) (Details)
$ in Millions
6 Months Ended
Mar. 31, 2017
USD ($)
Goodwill [Roll Forward]  
Goodwill, net, beginning balance $ 845.1
Currency translation (17.9)
Goodwill, net, ending balance 827.2
Industrial Gases - Americas [Member]  
Goodwill [Roll Forward]  
Goodwill, net, beginning balance 309.1
Currency translation (0.9)
Goodwill, net, ending balance 308.2
Industrial Gases - EMEA [Member]  
Goodwill [Roll Forward]  
Goodwill, net, beginning balance 380.6
Currency translation (17.0)
Goodwill, net, ending balance 363.6
Industrial Gases - Asia [Member]  
Goodwill [Roll Forward]  
Goodwill, net, beginning balance 135.2
Currency translation 0.3
Goodwill, net, ending balance 135.5
Industrial Gases - Global [Member]  
Goodwill [Roll Forward]  
Goodwill, net, beginning balance 20.2
Currency translation (0.3)
Goodwill, net, ending balance $ 19.9