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Business and Asset Actions- Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Restructuring and Related Activities [Abstract]      
Business and asset actions $ 57.0 $ 244.6 $ 73.7
Business and asset actions attributable to Air Products after tax $ 43.8 $ 204.9 $ 61.0