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Properties, Plants, and Equipment, Net | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Properties, Plants, and Equipment, Net | 7. Properties, Plants, and Equipment, Net The components of net properties, plants and equipment were as follows:
| December 31,
| 2020 |  | 2019
| (Dollars in millions)
Coke and energy plant, machinery and equipment | $ | 2,009.3 |  |  | $ | 1,968.2 |
Logistics plant, machinery and equipment | 157.3 |  |  | 147.9 |
Land and land improvements | 104.5 |  |  | 106.0 |
Construction-in-progress | 47.4 |  |  | 29.5 |
Other | 42.4 |  |  | 42.3 |
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 |

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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