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Segments - Financial Data for Continuing Operations for Company's Reportable Business Segments (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Segment Reporting Information [Line Items]        
Total Revenues $ 1,994.1 $ 1,811.7 $ 5,169.0 $ 4,684.2
Earnings (Loss) from operations 566.6 405.9 1,225.9 944.4
Interest expense 40.8 42.8 125.1 126.4
Other nonoperating income, net (14.3) (7.3) (49.2) (40.1)
Consolidated earnings from continuing operations before income tax expense 540.1 370.4 1,150.0 858.1
Building Materials Business        
Segment Reporting Information [Line Items]        
Total Revenues 1,918.6 1,736.0 4,929.6 4,449.8
Earnings (Loss) from operations 578.2 399.1 1,248.9 955.2
Reportable segments        
Segment Reporting Information [Line Items]        
Earnings (Loss) from operations 595.1 415.6 1,309.7 1,013.6
Operating Segments | Building Materials Business East Group        
Segment Reporting Information [Line Items]        
Total Revenues 814.3 773.6 2,079.0 1,866.9
Earnings (Loss) from operations 295.2 239.4 631.6 478.0
Operating Segments | Building Materials Business West Group        
Segment Reporting Information [Line Items]        
Total Revenues 1,104.3 962.4 2,850.6 2,582.9
Earnings (Loss) from operations 283.0 159.7 617.3 477.2
Operating Segments | Magnesia Specialties        
Segment Reporting Information [Line Items]        
Total Revenues 75.5 75.7 239.4 234.4
Earnings (Loss) from operations 16.9 16.5 60.8 58.4
Operating Segments | Building Materials Business        
Segment Reporting Information [Line Items]        
Total Revenues 1,918.6 1,736.0 4,929.6 4,449.8
Corporate        
Segment Reporting Information [Line Items]        
Earnings (Loss) from operations $ (28.5) $ (9.7) $ (83.8) $ (69.2)