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Variable Interest Entities - NGHC Joint Venture (Details) - Variable Interest Entity, Primary Beneficiary - NEOM Green Hydrogen Company - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
May 31, 2023
Dec. 31, 2023
Sep. 30, 2023
Variable Interest Entity [Line Items]      
Value of engineering, procurement, and construction agreement $ 6,700.0    
Voting interest in joint venture   33.30%  
Nonrecourse      
Variable Interest Entity [Line Items]      
Long-term debt, Principal Amount   $ 2,129.4 $ 1,364.8
NEOM Green Hydrogen Project Financing, Primary | Nonrecourse      
Variable Interest Entity [Line Items]      
Project financing maximum borrowing capacity   6,100.0  
Amount of debt funding (percent) 73.00%    
NEOM Green Hydrogen Project Financing, Working Capital | Nonrecourse      
Variable Interest Entity [Line Items]      
Project financing maximum borrowing capacity   500.0  
Saudi Riyal Loan Facility Two Point Zero Percent due 2040 | Nonrecourse      
Variable Interest Entity [Line Items]      
Long-term debt, Principal Amount   $ 620.0  
Interest rate, fixed percentage   2.00%