v3.25.2
Asset Retirement Obligation (Details)
$ in Millions
6 Months Ended 9 Months Ended
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Mar. 07, 2024
USD ($)
Dec. 31, 2023
USD ($)
Jul. 27, 2018
USD ($)
ARO Loss Contingencies [Line Items]              
Asset Retirement Obligation, Liabilities Incurred $ 11.1   $ 29.8        
Number Of Consent Decrees 2            
Asset Retirement Obligation $ 2,588.1     $ 2,572.2   $ 2,213.4  
Surety Bonds Outstanding Delivered To EPA         $ 327.1    
Asset retirement obligations $ 2,282.0     2,219.4      
Number Of Decades Remaining For Trust 3            
Asset Retirement Obligation, Liabilities Settled $ (154.8)   (253.8)        
Accretion expense for asset retirement obligations 64.8 $ 54.1 111.2        
Asset Retirement Obligation, Revision of Estimate 55.6   541.4        
Asset Retirement Obligation, Foreign Currency Translation Gain (Loss) 39.2   $ (69.8)        
Asset retirement obligations 306.1     352.8      
Unfavorable Regulatory Action | 2015 Consent Decrees With EPA              
ARO Loss Contingencies [Line Items]              
Asset retirement obligations, undiscounted       2,300.0      
Asset Retirement Obligation       1,100.0      
Bonnie Facility Trust [Member]              
ARO Loss Contingencies [Line Items]              
Assets Held-in-trust, Current             $ 21.0
Plant City and Bonnie Facilities              
ARO Loss Contingencies [Line Items]              
Asset retirement obligations $ 365.6     $ 368.7