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Long-lived Assets - Impairments, Held for Sale or Disposals (Tables) | 12 Months Ended
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Dec. 31, 2020
Discontinued Operations and Disposal Groups [Abstract] |
Long-lived Assets - Impairments of Assets Held and Used | Changes to Materials & Construction fixed assets and intangible assets for the year ended December 31, 2018 including such impairments were as follows (in millions):
Intangible Assets | Materials & Construction |  | Fixed Assets | Materials & Construction
Balance, January 1, 2018 | $ | 16.5 |  |  | Balance, January 1, 2018 | $ | 139.5 |
Additions to intangible assets | — |  |  | Additions to fixed assets | 11.1 |
Amortization | (0.9) |  |  | Depreciation | (11.2) |
Intangible impairment | (7.0) |  |  | Fixed asset impairment | (33.6) |
Balance, December 31, 2018 | $ | 8.6 |  |  | Balance, December 31, 2018 | $ | 105.8 |

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- Definition Tabular disclosure for impairment of long-lived assets held and used by an entity which includes a description of the impaired long-lived asset and facts and circumstances leading to the impairment, aggregate amount of the impairment loss and where the loss is located in the income statement, method(s) for determining fair value, and the segment in which the impaired long-lived asset is reported. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.CC) -URI http://asc.fasb.org/extlink&oid=27011434&loc=d3e125687-122742 + Details
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