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Revenue Recognition (Tables) | 3 Months Ended
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Mar. 31, 2022
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 |
|  | March 31, 2022 |
|  | Products and Services |  |  | Freight |  |  | Total |
|  | (Dollars in Millions) |
East Group |  | $ | 394.6 |  |  | $ | 24.2 |  |  | $ | 418.8 |
West Group |  |  | 682.4 |  |  |  | 52.6 |  |  |  | 735.0 |
Total Building Materials business |  |  | 1,077.0 |  |  |  | 76.8 |  |  |  | 1,153.8 |
Magnesia Specialties |  |  | 70.8 |  |  |  | 6.2 |  |  |  | 77.0 |
Total |  | $ | 1,147.8 |  |  | $ | 83.0 |  |  | $ | 1,230.8 |
|  | Three Months Ended |
|  | March 31, 2021 |
|  | Products and Services |  |  | Freight |  |  | Total |
|  | (Dollars in Millions) |
East Group |  | $ | 372.5 |  |  | $ | 22.4 |  |  | $ | 394.9 |
West Group |  |  | 484.1 |  |  |  | 32.5 |  |  |  | 516.6 |
Total Building Materials business |  |  | 856.6 |  |  |  | 54.9 |  |  |  | 911.5 |
Magnesia Specialties |  |  | 65.3 |  |  |  | 5.6 |  |  |  | 70.9 |
Total |  | $ | 921.9 |  |  | $ | 60.5 |  |  | $ | 982.4 |
Summary of Information About the Company's Contract Balances | The following table presents information about the Company’s contract balances:
(Dollars in Millions) |  | March 31, 2022 |  |  | December 31, 2021 |
Costs in excess of billings |  | $ | 3.9 |  |  | $ | 4.3 |
Billings in excess of costs |  | $ | 6.4 |  |  | $ | 7.8 |

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- Definition Schedule of revenue by category for reportable segment. + References No definition available. + Details
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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=123351226&loc=SL49130551-203045 + Details
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