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Cost Reduction and Asset Actions (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2017
Restructuring and Related Cost [Abstract]          
Cost reduction and asset actions $ 0.0 $ 42.7 $ 0.0 $ 103.0 $ 151.4
Cost Reduction Actions          
Restructuring and Related Cost [Abstract]          
Cost reduction and asset actions   42.7     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   9.5   27.5 66.3
Cost Reduction Actions | Asset Actions/Other          
Restructuring and Related Cost [Abstract]          
Cost reduction and asset actions   $ 33.2   $ 78.9 88.5
Business Realignment and Reorganization          
Restructuring and Related Cost [Abstract]          
Favorable restructuring reserve settlement         $ 3.4