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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

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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