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Revenue Recognition (Tables) | 6 Months Ended
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Jun. 30, 2021
Revenue From Contract With Customer [Abstract] |
Schedule of Company's Total Revenues by Category for each Reportable Segment | The following table presents the Company’s total revenues by category for each reportable segment.
|  | Three Months Ended |
|  | June 30, 2021 |
|  | Products and Services |  |  | Freight |  |  | Total |
|  | (Dollars in Millions) |
East Group |  | $ | 596.5 |  |  | $ | 38.8 |  |  | $ | 635.3 |
West Group |  |  | 628.8 |  |  |  | 38.0 |  |  |  | 666.8 |
Total Building Materials business |  |  | 1,225.3 |  |  |  | 76.8 |  |  |  | 1,302.1 |
Magnesia Specialties |  |  | 70.0 |  |  |  | 5.8 |  |  |  | 75.8 |
Total |  | $ | 1,295.3 |  |  | $ | 82.6 |  |  | $ | 1,377.9 |
|  | Three Months Ended |
|  | June 30, 2020 |
|  | Products and Services |  |  | Freight |  |  | Total |
|  | (Dollars in Millions) |
East Group |  | $ | 499.7 |  |  | $ | 34.8 |  |  | $ | 534.5 |
West Group |  |  | 640.9 |  |  |  | 41.6 |  |  |  | 682.5 |
Total Building Materials business |  |  | 1,140.6 |  |  |  | 76.4 |  |  |  | 1,217.0 |
Magnesia Specialties |  |  | 48.9 |  |  |  | 4.7 |  |  |  | 53.6 |
Total |  | $ | 1,189.5 |  |  | $ | 81.1 |  |  | $ | 1,270.6 |
|  | Six Months Ended |
|  | June 30, 2021 |
|  | Products and Services |  |  | Freight |  |  | Total |
|  | (Dollars in Millions) |
East Group |  | $ | 969.1 |  |  | $ | 61.1 |  |  | $ | 1,030.2 |
West Group |  |  | 1,112.9 |  |  |  | 70.5 |  |  |  | 1,183.4 |
Total Building Materials business |  |  | 2,082.0 |  |  |  | 131.6 |  |  |  | 2,213.6 |
Magnesia Specialties |  |  | 135.2 |  |  |  | 11.5 |  |  |  | 146.7 |
Total |  | $ | 2,217.2 |  |  | $ | 143.1 |  |  | $ | 2,360.3 |
|  | Six Months Ended |
|  | June 30, 2020 |
|  | Products and Services |  |  | Freight |  |  | Total |
|  | (Dollars in Millions) |
East Group |  | $ | 857.6 |  |  | $ | 58.9 |  |  | $ | 916.5 |
West Group |  |  | 1,114.1 |  |  |  | 79.0 |  |  |  | 1,193.1 |
Total Building Materials business |  |  | 1,971.7 |  |  |  | 137.9 |  |  |  | 2,109.6 |
Magnesia Specialties |  |  | 108.8 |  |  |  | 10.5 |  |  |  | 119.3 |
Total |  | $ | 2,080.5 |  |  | $ | 148.4 |  |  | $ | 2,228.9 |
Summary of Information About the Company's Contract Balances | The following table presents information about the Company’s contract balances:
(Dollars in Millions) |  | June 30, 2021 |  |  | December 31, 2020 |
Costs in excess of billings |  | $ | 12.1 |  |  | $ | 2.2 |
Billings in excess of costs |  | $ | 9.9 |  |  | $ | 14.0 |

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 + Details
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