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Cost Reduction and Asset Actions (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Sep. 30, 2017
Restructuring and Related Cost [Abstract]          
Cost reduction and asset actions $ 0.0 $ 10.3 $ 0.0 $ 60.3 $ 151.4
Cost Reduction Actions          
Restructuring and Related Cost [Abstract]          
Cost reduction and asset actions         154.8
Cost Reduction Actions | Industrial Gases - Americas          
Restructuring and Related Cost [Abstract]          
Cost reduction and asset actions         39.3
Cost Reduction Actions | Industrial Gases - EMEA          
Restructuring and Related Cost [Abstract]          
Cost reduction and asset actions         77.9
Cost Reduction Actions | Industrial Gases - Asia          
Restructuring and Related Cost [Abstract]          
Cost reduction and asset actions         0.9
Cost Reduction Actions | Industrial Gases - Global          
Restructuring and Related Cost [Abstract]          
Cost reduction and asset actions         2.5
Cost Reduction Actions | Corporate and other          
Restructuring and Related Cost [Abstract]          
Cost reduction and asset actions         34.2
Cost Reduction Actions | Severance And Other Benefits          
Restructuring and Related Cost [Abstract]          
Cost reduction and asset actions   $ 10.3   18.0 66.3
Cost Reduction Actions | Asset Actions/Other          
Restructuring and Related Cost [Abstract]          
Cost reduction and asset actions       $ 45.7 88.5
Business Realignment and Reorganization          
Restructuring and Related Cost [Abstract]          
Favorable restructuring reserve settlement         $ 3.4