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Accumulated Other Comprehensive Loss (Rollforward) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance $ 14,088.0 $ 12,443.1 $ 11,388.3
Other comprehensive income (loss) before reclassifications (1,463.0) 544.9 208.7
Amounts reclassified from AOCL 163.5 118.1 24.8
Total Other Comprehensive (Loss) Income (1,299.5) 663.0 233.5
Amount attributable to noncontrolling interest (29.3) 38.8 (2.0)
Ending balance 13,702.4 14,088.0 12,443.1
Derivatives qualifying as hedges      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance (28.3) (54.5) (61.4)
Other comprehensive income (loss) before reclassifications (120.3) 3.3 43.5
Amounts reclassified from AOCL 91.4 43.5 (57.7)
Total Other Comprehensive (Loss) Income (28.9) 46.8 (14.2)
Amount attributable to noncontrolling interest 14.7 20.6 (21.1)
Ending balance (71.9) (28.3) (54.5)
Foreign currency translation adjustments      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance (893.8) (1,142.8) (1,356.9)
Other comprehensive income (loss) before reclassifications (1,230.5) 267.3 233.4
Amounts reclassified from AOCL 7.3 0.0 0.0
Total Other Comprehensive (Loss) Income (1,223.2) 267.3 233.4
Amount attributable to noncontrolling interest (44.6) 18.3 19.3
Ending balance (2,072.4) (893.8) (1,142.8)
Pension and postretirement benefits      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance (593.8) (942.8) (957.3)
Other comprehensive income (loss) before reclassifications (112.2) 274.3 (68.2)
Amounts reclassified from AOCL 64.8 74.6 82.5
Total Other Comprehensive (Loss) Income (47.4) 348.9 14.3
Amount attributable to noncontrolling interest 0.6 (0.1) (0.2)
Ending balance (641.8) (593.8) (942.8)
AOCL attributable to Air Products      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance (1,515.9) (2,140.1) (2,375.6)
Total Other Comprehensive (Loss) Income (1,270.2) 624.2 235.5
Ending balance $ (2,786.1) $ (1,515.9) $ (2,140.1)