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Cost Reduction and Asset Actions (Narrative) (Details)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2019
USD ($)
position
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
position
Restructuring and Related Cost [Abstract]              
Cost reduction and asset actions $ 0.0 $ 25.5 $ 0.0 $ 0.0 $ 25.5 $ 0.0 $ 151.4
Cost Reduction and Asset Actions              
Restructuring and Related Cost [Abstract]              
Cost reduction and asset actions             154.8
Cost Reduction and Asset Actions | Industrial Gases - Americas              
Restructuring and Related Cost [Abstract]              
Cost reduction and asset actions             39.3
Cost Reduction and Asset Actions | Industrial Gases - EMEA              
Restructuring and Related Cost [Abstract]              
Cost reduction and asset actions             77.9
Cost Reduction and Asset Actions | Industrial Gases - Asia              
Restructuring and Related Cost [Abstract]              
Cost reduction and asset actions             0.9
Cost Reduction and Asset Actions | Industrial Gases - Global              
Restructuring and Related Cost [Abstract]              
Cost reduction and asset actions             2.5
Cost Reduction and Asset Actions | Corporate and other              
Restructuring and Related Cost [Abstract]              
Cost reduction and asset actions             34.2
Cost Reduction and Asset Actions | Severance and other benefits              
Restructuring and Related Cost [Abstract]              
Cost reduction and asset actions         $ 25.5   $ 66.3
Number of positions eliminated or expected to be eliminated | position         300    
Number of positions eliminated | position             625
Cost Reduction and Asset Actions | Asset actions              
Restructuring and Related Cost [Abstract]              
Cost reduction and asset actions             $ 88.5
Business Realignment and Reorganization              
Restructuring and Related Cost [Abstract]              
Favorable restructuring reserve settlement             $ 3.4