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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)