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Business Segments - Financial Data for Continuing Operations for Company's Reportable Business Segments (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | $ 1,377.9 | $ 1,270.6 | $ 2,360.3 | $ 2,228.9 |
Earnings (Loss) from operations | 307.5 | 306.4 | 406.8 | 364.2 |
Assets employed | 11,223.1 |  | 11,223.1 |  | $ 10,580.8
Products and Services |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 1,295.3 | 1,189.5 | 2,217.2 | 2,080.5 |
Building Materials Business |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 1,302.1 | 1,217.0 | 2,213.6 | 2,109.6 |
Earnings (Loss) from operations | 299.6 | 303.1 | 393.1 | 360.6 |
Assets employed | 10,506.3 |  | 10,506.3 |  | 9,698.0
Building Materials Business | Products and Services |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 1,225.3 | 1,140.6 | 2,082.0 | 1,971.7 |
Operating Segments | Building Materials Business East Group |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 635.3 | 534.5 | 1,030.2 | 916.5 |
Earnings (Loss) from operations | 197.8 | 169.9 | 259.5 | 204.7 |
Assets employed | 5,110.4 |  | 5,110.4 |  | 4,342.5
Operating Segments | Building Materials Business East Group | Products and Services |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 596.5 | 499.7 | 969.1 | 857.6 |
Operating Segments | Building Materials Business West Group |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 666.8 | 682.5 | 1,183.4 | 1,193.1 |
Earnings (Loss) from operations | 101.8 | 133.2 | 133.6 | 155.9 |
Assets employed | 5,395.9 |  | 5,395.9 |  | 5,355.5
Operating Segments | Building Materials Business West Group | Products and Services |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 628.8 | 640.9 | 1,112.9 | 1,114.1 |
Operating Segments | Magnesia Specialties |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 75.8 | 53.6 | 146.7 | 119.3 |
Earnings (Loss) from operations | 23.1 | 13.2 | 46.7 | 34.9 |
Assets employed | 168.3 |  | 168.3 |  | 167.9
Operating Segments | Magnesia Specialties | Products and Services |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 70.0 | 48.9 | 135.2 | 108.8 |
Operating Segments | Building Materials Business |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 1,302.1 | 1,217.0 | 2,213.6 | 2,109.6 |
Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Earnings (Loss) from operations | (15.2) | $ (9.9) | (33.0) | $ (31.3) |
Assets employed | $ 548.5 |  | $ 548.5 |  | $ 714.9

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