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Accumulated Other Comprehensive Loss (Rollforward) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     $ 7,079.6  
Other comprehensive income (loss) before reclassifications $ 164.5   11.5  
Amounts reclassified from AOCL 12.3   150.3  
Total Other Comprehensive Income (Loss) 176.8 $ (79.7) 161.8 $ 2.3
Spin-off of Versum     11.5  
Amount attributable to noncontrolling interests 0.2 $ (0.7) 2.1 $ 2.1
Ending balance 9,412.4   9,412.4  
Derivatives qualifying as hedges [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (58.5)   (65.0)  
Other comprehensive income (loss) before reclassifications 23.0   (2.2)  
Amounts reclassified from AOCL (23.6)   7.8  
Total Other Comprehensive Income (Loss) (0.6)   5.6  
Spin-off of Versum     0.2  
Amount attributable to noncontrolling interests 0.0   (0.1)  
Ending balance (59.1)   (59.1)  
Foreign currency translation adjustments [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (1,027.7)   (949.3)  
Other comprehensive income (loss) before reclassifications 141.4   9.8  
Amounts reclassified from AOCL 8.2   57.3  
Total Other Comprehensive Income (Loss) 149.6   67.1  
Spin-off of Versum     6.0  
Amount attributable to noncontrolling interests 0.2   2.1  
Ending balance (878.3)   (878.3)  
Pension and postretirement benefits [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (1,307.5)   (1,374.0)  
Other comprehensive income (loss) before reclassifications 0.1   3.9  
Amounts reclassified from AOCL 27.7   85.2  
Total Other Comprehensive Income (Loss) 27.8   89.1  
Spin-off of Versum     5.3  
Amount attributable to noncontrolling interests 0.0   0.1  
Ending balance (1,279.7)   (1,279.7)  
AOCL attributable to Air Products [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (2,393.7)   (2,388.3)  
Ending balance $ (2,217.1)   $ (2,217.1)