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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Revenue Recognition [Line Items] |  |  |  |
Total | $ 1,641.7 | $ 1,377.9 | $ 2,872.5 | $ 2,360.3
Building Materials Business |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 1,560.0 | 1,302.1 | 2,713.8 | 2,213.6
Products and Services |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 1,523.8 | 1,295.3 | 2,671.6 | 2,217.2
Products and Services | Building Materials Business |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 1,449.2 | 1,225.3 | 2,526.2 | 2,082.0
Freight |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 117.9 | 82.6 | 200.9 | 143.1
Freight | Building Materials Business |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 110.8 | 76.8 | 187.6 | 131.6
Operating Segments | Building Materials Business East Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 674.5 | 635.3 | 1,093.3 | 1,030.2
Operating Segments | Building Materials Business West Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 885.5 | 666.8 | 1,620.5 | 1,183.4
Operating Segments | Building Materials Business |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 1,560.0 | 1,302.1 | 2,713.8 | 2,213.6
Operating Segments | Magnesia Specialties |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 81.7 | 75.8 | 158.7 | 146.7
Operating Segments | Products and Services | Building Materials Business East Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 632.4 | 596.5 | 1,027.0 | 969.1
Operating Segments | Products and Services | Building Materials Business West Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 816.8 | 628.8 | 1,499.2 | 1,112.9
Operating Segments | Products and Services | Magnesia Specialties |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 74.6 | 70.0 | 145.4 | 135.2
Operating Segments | Freight | Building Materials Business East Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 42.1 | 38.8 | 66.3 | 61.1
Operating Segments | Freight | Building Materials Business West Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 68.7 | 38.0 | 121.3 | 70.5
Operating Segments | Freight | Building Materials Business |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 110.8 | 76.8 | 187.6 | 131.6
Operating Segments | Freight | Magnesia Specialties |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | $ 7.1 | $ 5.8 | $ 13.3 | $ 11.5

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