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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, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Segment Reporting Information [Line Items] |  |  |  |
Total Revenues | $ 1,641.7 | $ 1,377.9 | $ 2,872.5 | $ 2,360.3
Earnings (Loss) from operations | 478.6 | 307.5 | 538.4 | 406.8
Products and Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Revenues | 1,523.8 | 1,295.3 | 2,671.6 | 2,217.2
Building Materials Business |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Revenues | 1,560.0 | 1,302.1 | 2,713.8 | 2,213.6
Earnings (Loss) from operations | 485.1 | 299.6 | 556.1 | 393.1
Building Materials Business | Products and Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Revenues | 1,449.2 | 1,225.3 | 2,526.2 | 2,082.0
Operating Segments | Building Materials Business East Group |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Revenues | 674.5 | 635.3 | 1,093.3 | 1,030.2
Earnings (Loss) from operations | 210.6 | 197.8 | 238.5 | 259.5
Operating Segments | Building Materials Business East Group | Products and Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Revenues | 632.4 | 596.5 | 1,027.0 | 969.1
Operating Segments | Building Materials Business West Group |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Revenues | 885.5 | 666.8 | 1,620.5 | 1,183.4
Earnings (Loss) from operations | 274.5 | 101.8 | 317.6 | 133.6
Operating Segments | Building Materials Business West Group | Products and Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Revenues | 816.8 | 628.8 | 1,499.2 | 1,112.9
Operating Segments | Magnesia Specialties |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Revenues | 81.7 | 75.8 | 158.7 | 146.7
Earnings (Loss) from operations | 20.3 | 23.1 | 41.8 | 46.7
Operating Segments | Magnesia Specialties | Products and Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Revenues | 74.6 | 70.0 | 145.4 | 135.2
Operating Segments | Building Materials Business |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Revenues | 1,560.0 | 1,302.1 | 2,713.8 | 2,213.6
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earnings (Loss) from operations | $ (26.8) | $ (15.2) | $ (59.5) | $ (33.0)

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