Revenue from Contracts with Customers (Narrative) (Details) T in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) agreement performance_obligation T
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Number of coke sales agreements with fixed operating costs	4
Number of coke sales agreements with operating costs passed through to customers	3
Number of performance obligations in handling and mixing services | performance_obligation	2
Cokemaking
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligation (in tons) | T	22.0
Average remaining term	10 years
Logistics
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Average remaining term	3 years
Performance obligation amount | $	$ 27.4