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Revenue from Contracts with Customers (Tables)
12 Months Ended
Dec. 31, 2022
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue The following table provides disaggregated sales and other operating revenue by product or service, excluding intersegment revenues:
Years Ended December 31,
 202220212020
 (Dollars in millions)
Sales and other operating revenue:
Cokemaking$1,791.3 $1,293.6 $1,218.9 
Energy61.5 56.1 43.6 
Logistics76.7 64.3 35.5 
Operating and licensing fees38.0 36.6 31.6 
Other5.0 5.4 3.4 
Sales and other operating revenue$1,972.5 $1,456.0 $1,333.0