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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The changes in the carrying amount of goodwill (for each period a consolidated balance sheet is presented) allocated to the Company's reportable segments starting with the year ended December 31, 2019 and continuing to the year ended December 31, 2020 were as follows (in millions):
|  | Materials & Construction |  | Commercial Real Estate |  | Total
Carrying amount of goodwill: |  |  |  |  |  |
Gross amount of goodwill |  | $ | 93.6 |  |  | $ | 8.7 |  |  | $ | 102.3 |
Accumulated impairment losses |  | (37.2) |  |  | — |  |  | (37.2) |
Balance, January 1, 2019 |  | $ | 56.4 |  |  | $ | 8.7 |  |  | $ | 65.1 |
Impairment losses |  | (49.7) |  |  | — |  |  | (49.7) |
Carrying amount of goodwill: |  |  |  |  |  |
Gross amount of goodwill |  | 93.6 |  |  | 8.7 |  |  | 102.3 |
Accumulated impairment losses |  | (86.9) |  |  | — |  |  | (86.9) |
Balance, December 31, 2019 |  | $ | 6.7 |  |  | $ | 8.7 |  |  | $ | 15.4 |
Gross amount of goodwill included in disposal |  | (7.1) |  |  | — |  |  | (7.1) |
Accumulated impairment losses included in disposal |  | 2.2 |  |  | — |  |  | 2.2 |
Carrying amount of goodwill: |  |  |  |  |  |
Gross amount of goodwill |  | 86.5 |  |  | 8.7 |  |  | 95.2 |
Accumulated impairment losses |  | (84.7) |  |  | — |  |  | (84.7) |
Balance, December 31, 2020 |  | $ | 1.8 |  |  | $ | 8.7 |  |  | $ | 10.5 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267 + Details
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