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Intangible Contract Assets and Liabilities Textuals (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Coal supply agreements                
Coal Supply Agreements                
Amortization of Intangible Assets $ 121.3 $ 93.0            
Successor | Take-or-pay contracts                
Take-or-Pay Contracts                
Amortization Of Intangible Liabilities $ 22.5 $ 26.6            
Scenario, Forecast | Take-or-pay contracts                
Take-or-Pay Contracts                
Finite-Lived Intangible Liabilities, Amortization Expense, Next Twelve Months               $ 17.0
Finite-Lived Intangible Liabilities, Amortization Expense, Year Two             $ 9.0  
Finite-Lived Intangible Liabilities, Amortization Expense, Year Three           $ 4.0    
Finite-Lived Intangible Liabilities, Amortization Expense, Year Four         $ 3.0      
Finite-Lived Intangible Liabilities, Amortization Expense, Year Five     $ 21.0 $ 3.0        
Scenario, Forecast | Coal supply agreements                
Coal Supply Agreements                
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months               $ 27.0
Finite-Lived Intangible Assets, Amortization Expense, Year Two             $ 8.0  
Finite-Lived Intangible Assets, Amortization Expense, Year Three           $ 3.0    
Finite-Lived Intangible Assets, Amortization Expense, Year Four         $ 1.0      
Finite-Lived Intangible Assets, Amortization Expense, Year Five     $ 1.0