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Properties, Plants, and Equipment
 12 Months Ended
Dec. 31, 2022
Property, Plant and Equipment [Abstract]  
Properties, Plants, and Equipment
6. Properties, Plants, and Equipment
The components of net properties, plants and equipment were as follows:
 December  31,
 20222021
 (Dollars in millions)
Coke and energy plant, machinery and equipment$2,134.9 $2,077.3 
Logistics plant, machinery and equipment176.6 170.7 
Land and land improvements106.8 105.5 
Construction-in-progress40.7 50.8 
Other46.3 43.7 
Gross investment, at cost2,505.3 2,448.0 
Less: accumulated depreciation(1,276.0)(1,160.1)
Total properties, plants and equipment, net$1,229.3 $1,287.9