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Variable Interest Entities - NGHC Joint Venture Project Financing (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
May 31, 2023
Dec. 31, 2025
Dec. 31, 2024
Sep. 30, 2025
Variable Interest Entity [Line Items]        
Long-term debt proceeds   $ 382.5 $ 459.2  
Short-term borrowings   $ 66.7   $ 34.7
Variable Interest Entity, Primary Beneficiary | NEOM Green Hydrogen Company        
Variable Interest Entity [Line Items]        
Voting interest in joint venture   33.33%    
Value of engineering, procurement, and construction agreement $ 6,700.0      
Short-term borrowings   $ 36.7   24.0
Variable Interest Entity, Primary Beneficiary | NEOM Green Hydrogen Company | De-designated interest rate swap        
Variable Interest Entity [Line Items]        
Unrealized gain (loss) on de-designated cash flow hedging instruments, before tax     38.8  
Unrealized gain (loss) on de-designated cash flow hedging instruments, amount attributable to Air Products, after tax     10.3  
Unrealized gain (loss) on de-designated cash flow hedging instruments, amount attributable to noncontrolling interests     $ 25.2  
Variable Interest Entity, Primary Beneficiary | Nonrecourse | NEOM Green Hydrogen Company        
Variable Interest Entity [Line Items]        
Total principal borrowings   5,300.0   4,900.0
Variable Interest Entity, Primary Beneficiary | NEOM Green Hydrogen Project Financing, Primary | Nonrecourse | NEOM Green Hydrogen Company        
Variable Interest Entity [Line Items]        
Project financing maximum borrowing capacity   $ 6,100.0    
Amount of expected debt funding (percent)   73.00%    
Variable Interest Entity, Primary Beneficiary | NEOM Green Hydrogen Project Financing, Working Capital | Nonrecourse | NEOM Green Hydrogen Company        
Variable Interest Entity [Line Items]        
Project financing maximum borrowing capacity   $ 500.0    
Variable Interest Entity, Primary Beneficiary | Saudi Riyal Loan Facility Variable-Rate 5.00% | Nonrecourse | NEOM Green Hydrogen Company        
Variable Interest Entity [Line Items]        
Short-term borrowings   $ 36.7   $ 24.0
Interest rate, variable percentage   5.00%    
Variable Interest Entity, Primary Beneficiary | Saudi Riyal Facility Stated-Rate 2.00% | Nonrecourse | NEOM Green Hydrogen Company        
Variable Interest Entity [Line Items]        
Long-term debt proceeds   $ 365.0    
Interest rate, stated percentage   2.00%