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Revenues and Gross Profit - Total Revenues and Gross Profit by Product Line (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Product Information [Line Items] |  |  |  |
Total revenues | $ 1,377.9 | $ 1,270.6 | $ 2,360.3 | $ 2,228.9
Gross profit (loss) | 385.1 | 380.5 | 559.8 | 522.9
Interproduct Revenues |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | (96.7) | (75.9) | (169.8) | (129.5)
Corporate |  |  |  |
Product Information [Line Items] |  |  |  |
Gross profit (loss) | 0.5 | 4.5 | (0.2) | 3.6
Building Materials Business |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 1,302.1 | 1,217.0 | 2,213.6 | 2,109.6
Building Materials Business | Operating Segments |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 1,302.1 | 1,217.0 | 2,213.6 | 2,109.6
Gross profit (loss) | 357.6 | 359.1 | 505.6 | 477.2
Building Materials Business | Operating Segments | Products and Services |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 1,225.3 | 1,140.6 | 2,082.0 | 1,971.7
Gross profit (loss) | 356.9 | 359.4 | 505.1 | 477.8
Magnesia Specialties | Operating Segments |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 75.8 | 53.6 | 146.7 | 119.3
Gross profit (loss) | 27.0 | 16.9 | 54.4 | 42.1
Magnesia Specialties | Operating Segments | Products and Services |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 70.0 | 48.9 | 135.2 | 108.8
Gross profit (loss) | 27.9 | 18.2 | 56.3 | 44.3
Aggregates | Building Materials Business | Operating Segments | Reportable Subsegments | Products and Services |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 801.8 | 754.9 | 1,374.4 | 1,325.2
Gross profit (loss) | 273.0 | 268.0 | 394.7 | 361.3
Cement | Building Materials Business | Operating Segments | Reportable Subsegments | Products and Services |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 116.5 | 109.5 | 226.1 | 216.1
Gross profit (loss) | 36.1 | 43.4 | 51.4 | 70.7
Ready Mixed Concrete | Building Materials Business | Operating Segments | Reportable Subsegments | Products and Services |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 268.4 | 245.1 | 503.7 | 434.8
Gross profit (loss) | 19.1 | 26.1 | 38.6 | 32.0
Asphalt and Paving | Building Materials Business | Operating Segments | Reportable Subsegments | Products and Services |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 135.3 | 107.0 | 147.6 | 125.1
Gross profit (loss) | 28.7 | 21.9 | 20.4 | 13.8
Freight |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 82.6 | 81.1 | 143.1 | 148.4
Freight | Building Materials Business |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 76.8 | 76.4 | 131.6 | 137.9
Freight | Building Materials Business | Operating Segments |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 76.8 | 76.4 | 131.6 | 137.9
Gross profit (loss) | 0.7 | (0.3) | 0.5 | (0.6)
Freight | Magnesia Specialties | Operating Segments |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 5.8 | 4.7 | 11.5 | 10.5
Gross profit (loss) | $ (0.9) | $ (1.3) | $ (1.9) | $ (2.2)

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