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Business Segments - Financial Data for Continuing Operations for Company's Reportable Business Segments (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | $ 1,557.3 | $ 1,321.4 | $ 3,917.6 | $ 3,550.3 |
Earnings (Loss) from operations | 356.9 | 400.6 | 763.7 | 764.8 |
Assets employed | 13,786.2 |  | 13,786.2 |  | $ 10,580.8
Products and Services |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 1,462.7 | 1,240.7 | 3,679.9 | 3,321.2 |
Building Materials Business |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 1,478.9 | 1,260.5 | 3,692.6 | 3,370.1 |
Earnings (Loss) from operations | 356.4 | 393.7 | 749.5 | 754.3 |
Assets employed | 10,689.3 |  | 10,689.3 |  | 9,698.0
Building Materials Business | Products and Services |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 1,390.8 | 1,185.5 | 3,472.8 | 3,157.2 |
Operating Segments | Building Materials Business East Group |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 684.1 | 549.3 | 1,714.4 | 1,465.9 |
Earnings (Loss) from operations | 205.8 | 181.4 | 465.3 | 386.1 |
Assets employed | 5,075.9 |  | 5,075.9 |  | 4,342.5
Operating Segments | Building Materials Business East Group | Products and Services |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 641.8 | 514.1 | 1,610.9 | 1,371.8 |
Operating Segments | Building Materials Business West Group |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 794.8 | 711.2 | 1,978.2 | 1,904.2 |
Earnings (Loss) from operations | 150.6 | 212.3 | 284.2 | 368.2 |
Assets employed | 5,613.4 |  | 5,613.4 |  | 5,355.5
Operating Segments | Building Materials Business West Group | Products and Services |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 749.0 | 671.4 | 1,861.9 | 1,785.4 |
Operating Segments | Magnesia Specialties |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 78.4 | 60.9 | 225.0 | 180.2 |
Earnings (Loss) from operations | 23.1 | 16.4 | 69.8 | 51.2 |
Assets employed | 169.6 |  | 169.6 |  | 167.9
Operating Segments | Magnesia Specialties | Products and Services |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 71.9 | 55.2 | 207.1 | 164.0 |
Operating Segments | Building Materials Business |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 1,478.9 | 1,260.5 | 3,692.6 | 3,370.1 |
Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Earnings (Loss) from operations | (22.6) | $ (9.5) | (55.6) | $ (40.7) |
Assets employed | $ 2,927.3 |  | $ 2,927.3 |  | $ 714.9

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