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Business Segment Information (Segment Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]    
Total assets $ 1,654.6 $ 1,615.4
Corporate and Other    
Segment Reporting Information [Line Items]    
Total assets 22.8 23.9
Operating Segments | Domestic Coke    
Segment Reporting Information [Line Items]    
Total assets 1,422.6 1,370.6
Operating Segments | Brazil Coke    
Segment Reporting Information [Line Items]    
Total assets 15.7 18.0
Operating Segments | Logistics    
Segment Reporting Information [Line Items]    
Total assets $ 193.5 $ 202.9