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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, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Revenue Recognition [Line Items] |  |  |  |
Total | $ 1,377.9 | $ 1,270.6 | $ 2,360.3 | $ 2,228.9
Building Materials Business |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 1,302.1 | 1,217.0 | 2,213.6 | 2,109.6
Products and Services |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 1,295.3 | 1,189.5 | 2,217.2 | 2,080.5
Products and Services | Building Materials Business |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 1,225.3 | 1,140.6 | 2,082.0 | 1,971.7
Freight |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 82.6 | 81.1 | 143.1 | 148.4
Freight | Building Materials Business |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 76.8 | 76.4 | 131.6 | 137.9
Operating Segments | Building Materials Business East Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 635.3 | 534.5 | 1,030.2 | 916.5
Operating Segments | Building Materials Business West Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 666.8 | 682.5 | 1,183.4 | 1,193.1
Operating Segments | Building Materials Business |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 1,302.1 | 1,217.0 | 2,213.6 | 2,109.6
Operating Segments | Magnesia Specialties |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 75.8 | 53.6 | 146.7 | 119.3
Operating Segments | Products and Services | Building Materials Business East Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 596.5 | 499.7 | 969.1 | 857.6
Operating Segments | Products and Services | Building Materials Business West Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 628.8 | 640.9 | 1,112.9 | 1,114.1
Operating Segments | Products and Services | Magnesia Specialties |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 70.0 | 48.9 | 135.2 | 108.8
Operating Segments | Freight | Building Materials Business East Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 38.8 | 34.8 | 61.1 | 58.9
Operating Segments | Freight | Building Materials Business West Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 38.0 | 41.6 | 70.5 | 79.0
Operating Segments | Freight | Building Materials Business |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 76.8 | 76.4 | 131.6 | 137.9
Operating Segments | Freight | Magnesia Specialties |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | $ 5.8 | $ 4.7 | $ 11.5 | $ 10.5

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