v3.25.3
Equity (Details)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Aug. 22, 2025
$ / shares
Aug. 07, 2025
USD ($)
$ / shares
shares
Feb. 28, 2025
$ / shares
shares
Jun. 21, 2023
Sep. 30, 2025
USD ($)
$ / shares
shares
Jun. 30, 2025
$ / shares
shares
Mar. 31, 2025
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Jun. 30, 2022
$ / T
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
Dec. 31, 2024
shares
Equity [Line Items]                          
Percent of royalty fee income                   3.00%      
Price per ton of coal processed at preparation plants (in Dollars per US Ton) | $ / T                   5      
Price per ton of loaded coal at rail load-out facilities (in Dollars per US Ton) | $ / T                   2.5      
Threshold trading days volume weighted average price                     20    
Share price     $ 8.85   $ 16           $ 16    
Compensation costs (in Dollars) | $         $ 4.7     $ 4.0     $ 12.8 $ 13.3  
Incremental compensation costs associated with modifications (in Dollars) | $                 $ 1.2        
Incremental value (in Dollars) | $                 1.8        
Reversal of previously recognized compensation expense (in Dollars) | $                 0.6        
Pre-modified restricted stock award (in Dollars) | $                 0.3        
Forfeiture of restricted stock units and performance stock units (in Dollars) | $                 $ 0.3        
Dividend declared         $ 0.1918                
Number of Class B common stock received as dividend from each Class B common stock (in Shares) | shares     0.015537   0.011988                
Restricted Stock [Member]                          
Equity [Line Items]                          
Fair value of awards (in Dollars) | $             $ 2.7            
Vesting period             3 years            
Restricted Stock Units [Member]                          
Equity [Line Items]                          
Granted (in Shares) | shares             713,305            
Fair value of awards (in Dollars) | $             $ 7.0            
Vesting period             3 years            
Granted, Weighted average grant date fair value             $ 9.81            
Number of voting rights                        
Number of dividend rights                        
Shares delivered per unit awarded (in Shares) | shares             1            
Performance Stock Units [Member]                          
Equity [Line Items]                          
Vesting period             3 years            
Number of voting rights                        
Number of dividend rights                        
O 2024 Q3 Dividends [Member]                          
Equity [Line Items]                          
Dividend declared                     $ 0.2364    
O 2025 Q1 Dividends [Member]                          
Equity [Line Items]                          
Dividend declared           $ 0.06875              
Class B Common Stock [Member]                          
Equity [Line Items]                          
Distribution ratio       0.2                  
Number of votes per common share       1             1    
Percentage of dividends                   20.00%      
Common stock issuance shares (in Shares) | shares         10,842,811           10,842,811   9,549,914
Granted (in Shares) | shares                        
Cash dividend per share $ 0.1918                        
Class B Common Stock [Member] | Q1 2024 Dividends [Member]                          
Equity [Line Items]                          
Date dividends declared                     Feb. 01, 2024    
Dividend declared                     $ 0.2416    
Date of dividend paid                     Mar. 15, 2024    
Date of dividend record                     Mar. 01, 2024    
Class B Common Stock [Member] | Q2 2025 Dividends [Member]                          
Equity [Line Items]                          
Dividend declared                     $ 0.2376    
Class B Common Stock [Member] | Q2 2025 Dividends [Member]                          
Equity [Line Items]                          
Share price           7.45              
Dividend declared           $ 0.1811         $ 0.2246    
Date of dividend paid           Jun. 13, 2025              
Date of dividend record           May 30, 2025              
Class B Common Stock [Member] | O 2025 Q1 Dividends [Member]                          
Equity [Line Items]                          
Date dividends declared             Feb. 18, 2025            
Dividend declared             $ 0.1971            
Class A Common Stock [Member]                          
Equity [Line Items]                          
Number of votes per common share                     1    
Common stock issuance shares (in Shares) | shares   10,666,667     55,169,250           55,169,250   43,824,999
Public per share   $ 18.75                      
Share price   $ 17.71875                      
Net proceeds offering cost (in Dollars) | $   $ 188.1                      
Class A Common Stock [Member] | Q1 2024 Dividends [Member]                          
Equity [Line Items]                          
Date dividends declared                     Dec. 06, 2023    
Dividend declared                     $ 0.1375    
Date of dividend paid                     Mar. 15, 2024    
Date of dividend record                     Mar. 01, 2024    
Class A Common Stock [Member] | Q2 2025 Dividends [Member]                          
Equity [Line Items]                          
Dividend declared                     $ 0.1375    
Date of dividend paid                     Jun. 15, 2024    
Class A Common Stock [Member] | Q2 2025 Dividends [Member]                          
Equity [Line Items]                          
Date dividends declared           Mar. 17, 2025              
Dividend declared           $ 0.06875         $ 0.1375    
Date of dividend record           May 30, 2025              
Number of Class B common stock received as dividend from each Class B common stock (in Shares) | shares           0.009228              
Class A Common Stock [Member] | O 2024 Q3 Dividends [Member]                          
Equity [Line Items]                          
Dividend declared                     $ 0.1375    
Class A Common Stock [Member] | O 2025 Q1 Dividends [Member]                          
Equity [Line Items]                          
Date dividends declared             Dec. 05, 2024            
Dividend declared             $ 0.1375            
Date of dividend paid             Mar. 14, 2025            
Date of dividend record             Feb. 28, 2025            
Executives and Employees [Member] | Restricted Stock [Member]                          
Equity [Line Items]                          
Granted (in Shares) | shares             341,295            
Fair value of awards (in Dollars) | $             $ 3.3            
Executives and Employees [Member] | Performance Stock Units [Member]                          
Equity [Line Items]                          
Granted (in Shares) | shares             713,305            
Fair value of awards (in Dollars) | $             $ 10.7            
Granted, Weighted average grant date fair value             $ 15.03            
Shares delivered per unit awarded (in Shares) | shares             1            
Executives and Employees [Member] | Minimum [Member] | Performance Stock Units [Member]                          
Equity [Line Items]                          
Potential earnings             0.00%            
Executives and Employees [Member] | Maximum [Member] | Performance Stock Units [Member]                          
Equity [Line Items]                          
Potential earnings             200.00%            
Directors [Member] | Restricted Stock [Member]                          
Equity [Line Items]                          
Fair value of awards (in Dollars) | $             $ 0.6            
Vesting period             1 year