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Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019
Goodwill
Net balances at December 31, 2018	$ 76.9	$ 3.4	$ 76.9
Impairment			(73.5)
Net balances at December 31, 2019 and 2020		3.4	3.4
Domestic Coke
Goodwill
Net balances at December 31, 2018	3.4	3.4	3.4
Impairment		0.0	0.0
Net balances at December 31, 2019 and 2020		3.4	3.4
Logistics
Goodwill
Net balances at December 31, 2018	73.5	0.0	73.5
Impairment	$ (73.5)		(73.5)
Net balances at December 31, 2019 and 2020		$ 0.0	$ 0.0

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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