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Commitments and Contingencies (Guarantees and Other Narrative) (Details)
£ in Millions, $ in Millions
Sep. 30, 2017
USD ($)
Sep. 30, 2017
GBP (£)
Sep. 30, 2016
USD ($)
Apr. 30, 2015
Guarantor Obligations [Line Items]        
Obligation for future contribution to equity affiliate $ 94.4   $ 94.4  
Equity contributions or payments required 0.0      
Unrecorded Unconditional Purchase Obligation [Line Items]        
Unconditional purchase obligation 6,533.0      
Purchase obligations in 2018 822.0      
Jazan Gas Projects Company        
Guarantor Obligations [Line Items]        
Obligation for future contribution to equity affiliate 94.4   $ 94.4  
Jazan Gas Projects Company | Financial Guarantee        
Guarantor Obligations [Line Items]        
Percentage guaranteed share of loan       25.00%
Maximum potential payment under guarantees 100.0      
Jazan Gas Projects Company | Performance Guarantee        
Guarantor Obligations [Line Items]        
Maximum potential payment under guarantees 262.0      
Helium Purchases        
Unrecorded Unconditional Purchase Obligation [Line Items]        
Unconditional purchase obligation 5,600.0      
HyCO Feedstock Supply        
Unrecorded Unconditional Purchase Obligation [Line Items]        
Unconditional purchase obligation 280.0      
Purchase Commitments for Plant and Equipment        
Unrecorded Unconditional Purchase Obligation [Line Items]        
Purchase obligations in 2018 300.0      
Jazan Gas Projects Company        
Unrecorded Unconditional Purchase Obligation [Line Items]        
Purchase obligations in 2018 $ 180.0      
Trinidad Facility | Performance Guarantee        
Guarantor Obligations [Line Items]        
Percentage guaranteed share of loan 50.00% 50.00%    
Maximum potential payment under guarantees $ 28.0      
U.K. and Ireland Homecare Business | Performance Guarantee        
Guarantor Obligations [Line Items]        
Maximum potential payment under guarantees $ 25.0 £ 20