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Properties, Plants, and Equipment, Net (Components) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Gross investment, at cost	$ 2,360.9	$ 2,293.9
Less: accumulated depreciation	(1,032.9)	(903.7)
Total properties, plants and equipment, net	1,328.0	1,390.2
Coke and energy plant, machinery and equipment
Property, Plant and Equipment [Line Items]
Gross investment, at cost	2,009.3	1,968.2
Logistics plant, machinery and equipment
Property, Plant and Equipment [Line Items]
Gross investment, at cost	157.3	147.9
Land and land improvements
Property, Plant and Equipment [Line Items]
Gross investment, at cost	104.5	106.0
Construction-in-progress
Property, Plant and Equipment [Line Items]
Gross investment, at cost	47.4	29.5
Other
Property, Plant and Equipment [Line Items]
Gross investment, at cost	$ 42.4	$ 42.3

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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