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Business Segments (Tables) | 9 Months Ended
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Sep. 30, 2020
Segment Reporting [Abstract] |
Financial Data for Continuing Operation for Company's Reportable Business Segments | The following table displays selected financial data for the Company’s reportable segments. Total revenues, as presented on the consolidated statements of earnings and comprehensive earnings, exclude intersegment revenues, which represent sales from one segment to another segment and are eliminated in consolidation. Prior-year reportable segment information has been reclassified to conform to the current-year presentation.
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
|  | (Dollars in Millions) |
Total revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
East Group |  | $ | 549.3 |  |  | $ | 582.0 |  |  | $ | 1,465.9 |  |  | $ | 1,500.8 |
West Group |  |  | 711.2 |  |  |  | 773.4 |  |  |  | 1,904.2 |  |  |  | 1,922.7 |
Total Building Materials Business |  |  | 1,260.5 |  |  |  | 1,355.4 |  |  |  | 3,370.1 |  |  |  | 3,423.5 |
Magnesia Specialties |  |  | 60.9 |  |  |  | 64.8 |  |  |  | 180.2 |  |  |  | 215.2 |
Total |  | $ | 1,321.4 |  |  | $ | 1,420.2 |  |  | $ | 3,550.3 |  |  | $ | 3,638.7 |
Products and services revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
East Group |  | $ | 514.1 |  |  | $ | 539.8 |  |  | $ | 1,371.8 |  |  | $ | 1,398.6 |
West Group |  |  | 671.4 |  |  |  | 724.1 |  |  |  | 1,785.4 |  |  |  | 1,800.1 |
Total Building Materials Business |  |  | 1,185.5 |  |  |  | 1,263.9 |  |  |  | 3,157.2 |  |  |  | 3,198.7 |
Magnesia Specialties |  |  | 55.2 |  |  |  | 59.3 |  |  |  | 164.0 |  |  |  | 198.9 |
Total |  | $ | 1,240.7 |  |  | $ | 1,323.2 |  |  | $ | 3,321.2 |  |  | $ | 3,397.6 |
Earnings (Loss) from operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
East Group |  | $ | 181.4 |  |  | $ | 190.8 |  |  | $ | 386.1 |  |  | $ | 416.5 |
West Group(1) |  |  | 212.3 |  |  |  | 156.8 |  |  |  | 368.2 |  |  |  | 287.7 |
Total Building Materials Business |  |  | 393.7 |  |  |  | 347.6 |  |  |  | 754.3 |  |  |  | 704.2 |
Magnesia Specialties |  |  | 16.4 |  |  |  | 20.1 |  |  |  | 51.2 |  |  |  | 68.0 |
Corporate |  |  | (9.5 | ) |  |  | (22.4 | ) |  |  | (40.7 | ) |  |  | (71.8 | )
Total |  | $ | 400.6 |  |  | $ | 345.3 |  |  | $ | 764.8 |  |  | $ | 700.4 |
(1) 2020 amounts include nonrecurring gains on sales of investment land and divested assets of $69.9 million
|  | September 30, 2020 |  |  | December 31, 2019 |
Assets employed: |  | (Dollars in Millions) |
East Group |  | $ | 4,373.9 |  |  | $ | 4,320.6 |
West Group |  |  | 5,390.3 |  |  |  | 5,321.9 |
Total Building Materials Business |  |  | 9,764.2 |  |  |  | 9,642.5 |
Magnesia Specialties |  |  | 163.5 |  |  |  | 176.2 |
Corporate |  |  | 507.7 |  |  |  | 312.9 |
Total |  | $ | 10,435.4 |  |  | $ | 10,131.6 |

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599 Reference 3: 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=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8721-108599 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8906-108599 + Details
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