v3.26.1
OTHER ASSETS (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Sep. 30, 2025
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Asset Acquisition [Line Items]              
Capital contributions $ 20.5   $ 22.4 $ 20.5 $ 22.4 $ 21.3 $ 23.0
Losses of non-consolidated affiliates (1.0)   (1.4) (2.4) 1.4    
Supply contracts 957.2   1,006.4 957.2 1,006.4 996.0  
Pension assets 124.1   60.3 124.1 60.3 106.8  
Capital contributions 20.5   22.4 20.5 22.4 21.3 $ 23.0
Other 68.0   70.6 68.0 70.6 85.9  
Other assets 1,169.8   1,159.7 1,169.8 1,159.7 $ 1,210.0  
Amortization of Supply Contracts 21.7   20.9 43.4 41.8    
Hidrogenii              
Asset Acquisition [Line Items]              
Investment Tax Credit   $ 22.0          
Investment Tax Credit   $ 22.0          
Hidrogenii              
Asset Acquisition [Line Items]              
Capital contributions 1.9   0.8 1.9 0.8    
Losses of non-consolidated affiliates       (2.7) (1.4)    
Other(1) 0.3            
Capital contributions 1.9   $ 0.8 $ 1.9 $ 0.8    
Other(1) $ 0.3            
Nilico Hydrogen Holdings LLC | Hidrogenii              
Asset Acquisition [Line Items]              
Equity Method Investment, Ownership Percentage 50.00%     50.00%      
Equity Method Investment, Ownership Percentage 50.00%     50.00%      
PLug Power LA LLC | Hidrogenii              
Asset Acquisition [Line Items]              
Equity Method Investment, Ownership Percentage 50.00%     50.00%      
Equity Method Investment, Ownership Percentage 50.00%     50.00%