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Revenue from Contracts with Customers (Tables)
 9 Months Ended
Sep. 30, 2023
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of Revenue
The following table provides disaggregated sales and other operating revenue by product or service, excluding intersegment revenues:    
Three Months Ended September 30,Nine Months Ended September 30,
 2023202220232022
 (Dollars in millions)
Sales and other operating revenue:
Cokemaking$481.3 $468.5 $1,418.5 $1,319.4 
Energy12.5 17.3 36.5 49.0 
Logistics15.4 20.1 55.6 58.4 
Operating and licensing fees9.1 8.9 25.8 27.9 
Other2.1 2.0 6.2 3.8 
Sales and other operating revenue$520.4 $516.8 $1,542.6 $1,458.5 
The following tables provide disaggregated sales and other operating revenue by customer:
Three Months Ended September 30,Nine Months Ended September 30,
2023202220232022
(Dollars in millions)
Sales and other operating revenue:
Cliffs Steel$338.7 $302.7 $1,000.8 $861.4 
U.S. Steel79.2 75.2 230.4 209.8 
Other102.5 138.9 311.4 387.3 
Sales and other operating revenue$520.4 $516.8 $1,542.6 $1,458.5