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Segments - Financial Data for Continuing Operations for Company's Reportable Business Segments (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Segment Reporting Information [Line Items] |  |
Total Revenues | $ 1,354.1 | $ 1,230.8
Earnings (Loss) from operations | 196.1 | 59.9
Building Materials Business |  |
Segment Reporting Information [Line Items] |  |
Total Revenues | 1,270.7 | 1,153.8
Earnings (Loss) from operations | 203.6 | 71.0
Operating Segments | Building Materials Business East Group |  |
Segment Reporting Information [Line Items] |  |
Total Revenues | 529.6 | 418.8
Earnings (Loss) from operations | 108.9 | 28.0
Operating Segments | Building Materials Business West Group |  |
Segment Reporting Information [Line Items] |  |
Total Revenues | 741.1 | 735.0
Earnings (Loss) from operations | 94.7 | 43.0
Operating Segments | Magnesia Specialties |  |
Segment Reporting Information [Line Items] |  |
Total Revenues | 83.4 | 77.0
Earnings (Loss) from operations | 20.6 | 21.5
Operating Segments | Building Materials Business |  |
Segment Reporting Information [Line Items] |  |
Total Revenues | 1,270.7 | 1,153.8
Corporate |  |
Segment Reporting Information [Line Items] |  |
Earnings (Loss) from operations | $ (28.1) | $ (32.6)

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