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Commitments and Contingent Liabilities - Summary of Annual Black Lung Payments and (Benefit) (Details) - Black lung Benefit - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Aug. 13, 2024
Sep. 30, 2024
Sep. 30, 2024
Dec. 31, 2023
Loss Contingencies [Line Items]        
Payments     $ 39.7 $ 5.4
(Benefit) expense     (4.1) $ 5.5
Settlement payment     3.7  
Accretion expense     5.4  
Gain on settlement included in selling, general and administrative   $ 9.5 9.5  
DCMWC        
Loss Contingencies [Line Items]        
Settlement payment $ 36.0   $ 36.0