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Business Restructuring and Cost Reduction Actions (Narrative) (Details)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
$ / shares
Sep. 30, 2014
USD ($)
Employees
$ / shares
Jun. 30, 2014
USD ($)
Sep. 30, 2013
USD ($)
$ / shares
Jun. 30, 2015
USD ($)
Employees
$ / shares
Jun. 30, 2014
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2013
USD ($)
Restructuring and Related Cost [Line Items]                
Business restructuring and cost reduction actions $ 58.2   $ 0.0   $ 146.0 $ 0.0    
Business Realignment and Reorganization [Member]                
Restructuring and Related Cost [Line Items]                
Business restructuring and cost reduction actions 58.2 $ 12.7     146.0   $ 12.7  
Business restructuring and cost reduction actions, after-tax $ 38.8 $ 8.2     $ 98.7      
Business restructuring and cost reduction actions, per share | $ / shares $ 0.18 $ 0.04     $ 0.45      
Number of positions to be eliminated | Employees   50     1,500      
Business Realignment and Reorganization [Member] | Industrial Gases - Americas [Member]                
Restructuring and Related Cost [Line Items]                
Business restructuring and cost reduction actions   $ 2.9     $ 19.9      
Business Realignment and Reorganization [Member] | Industrial Gases - EMEA [Member]                
Restructuring and Related Cost [Line Items]                
Business restructuring and cost reduction actions   3.1     40.0      
Business Realignment and Reorganization [Member] | Industrial Gases - Asia [Member]                
Restructuring and Related Cost [Line Items]                
Business restructuring and cost reduction actions   1.5     8.1      
Business Realignment and Reorganization [Member] | Industrial Gases - Global [Member]                
Restructuring and Related Cost [Line Items]                
Business restructuring and cost reduction actions   1.5     31.4      
Business Realignment and Reorganization [Member] | Materials Technologies [Member]                
Restructuring and Related Cost [Line Items]                
Business restructuring and cost reduction actions   1.6     19.3      
Business Realignment and Reorganization [Member] | Energy From Waste [Member]                
Restructuring and Related Cost [Line Items]                
Business restructuring and cost reduction actions   0.0     0.0      
Business Realignment and Reorganization [Member] | Corporate and Other [Member]                
Restructuring and Related Cost [Line Items]                
Business restructuring and cost reduction actions   $ 2.1     27.3      
Business Realignment and Reorganization [Member] | Asset Actions [Member]                
Restructuring and Related Cost [Line Items]                
Business restructuring and cost reduction actions $ 35.7       35.7   0.0  
Business Realignment and Reorganization [Member] | Severance And Other Benefits [Member]                
Restructuring and Related Cost [Line Items]                
Business restructuring and cost reduction actions $ 22.5       $ 110.3   $ 12.7  
Plan 2013 [Member]                
Restructuring and Related Cost [Line Items]                
Business restructuring and cost reduction actions       $ 231.6       $ 231.6
Business restructuring and cost reduction actions, after-tax       $ 157.9        
Business restructuring and cost reduction actions, per share | $ / shares       $ 0.74        
Plan 2013 [Member] | Asset Actions [Member]                
Restructuring and Related Cost [Line Items]                
Business restructuring and cost reduction actions               100.4
Plan 2013 [Member] | Severance And Other Benefits [Member]                
Restructuring and Related Cost [Line Items]                
Business restructuring and cost reduction actions               71.9
Plan 2013 [Member] | Contract Actions [Member]                
Restructuring and Related Cost [Line Items]                
Business restructuring and cost reduction actions               $ 59.3