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Revenue Recognition - Schedule of Company's Total Revenues by Category for each Reportable Segment (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Revenue Recognition [Line Items] |  |  |  |
Total | $ 1,811.7 | $ 1,557.3 | $ 4,684.2 | $ 3,917.6
Building Materials Business |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 1,736.0 | 1,478.9 | 4,449.8 | 3,692.6
Products and Services |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 1,680.5 | 1,462.7 | 4,352.1 | 3,679.9
Products and Services | Building Materials Business |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 1,611.5 | 1,390.8 | 4,137.7 | 3,472.8
Freight |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 131.2 | 94.6 | 332.1 | 237.7
Freight | Building Materials Business |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 124.5 | 88.1 | 312.1 | 219.8
Operating Segments | Building Materials Business East Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 773.6 | 684.1 | 1,866.9 | 1,714.4
Operating Segments | Building Materials Business West Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 962.4 | 794.8 | 2,582.9 | 1,978.2
Operating Segments | Building Materials Business |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 1,736.0 | 1,478.9 | 4,449.8 | 3,692.6
Operating Segments | Magnesia Specialties |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 75.7 | 78.4 | 234.4 | 225.0
Operating Segments | Products and Services | Building Materials Business East Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 728.5 | 641.8 | 1,755.5 | 1,610.9
Operating Segments | Products and Services | Building Materials Business West Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 883.0 | 749.0 | 2,382.2 | 1,861.9
Operating Segments | Products and Services | Magnesia Specialties |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 69.0 | 71.9 | 214.4 | 207.1
Operating Segments | Freight | Building Materials Business East Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 45.1 | 42.3 | 111.4 | 103.5
Operating Segments | Freight | Building Materials Business West Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 79.4 | 45.8 | 200.7 | 116.3
Operating Segments | Freight | Building Materials Business |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 124.5 | 88.1 | 312.1 | 219.8
Operating Segments | Freight | Magnesia Specialties |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | $ 6.7 | $ 6.5 | $ 20.0 | $ 17.9

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