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Business Segments - Financial Data for Continuing Operations for Company's Reportable Business Segments (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Segment Reporting Information [Line Items]        
Total revenues $ 1,270.6 $ 1,279.5 $ 2,228.9 $ 2,218.4
Earnings (Loss) from operations 306.4 285.9 364.2 355.1
Products and Services        
Segment Reporting Information [Line Items]        
Total revenues 1,189.5 1,196.1 2,080.5 2,074.4
Building Materials Business        
Segment Reporting Information [Line Items]        
Total revenues 1,217.0 1,203.2 2,109.6 2,068.1
Earnings (Loss) from operations 303.1 284.6 360.6 356.6
Building Materials Business | Products and Services        
Segment Reporting Information [Line Items]        
Total revenues 1,140.6 1,125.7 1,971.7 1,934.9
Operating Segments | Building Materials Business Mid-America Group        
Segment Reporting Information [Line Items]        
Total revenues 392.3 414.5 653.1 662.6
Earnings (Loss) from operations 136.2 141.3 157.0 171.9
Operating Segments | Building Materials Business Mid-America Group | Products and Services        
Segment Reporting Information [Line Items]        
Total revenues 362.9 381.9 603.9 611.5
Operating Segments | Building Materials Business Southeast Group        
Segment Reporting Information [Line Items]        
Total revenues 142.2 137.0 263.4 256.3
Earnings (Loss) from operations 33.7 32.7 47.7 53.8
Operating Segments | Building Materials Business Southeast Group | Products and Services        
Segment Reporting Information [Line Items]        
Total revenues 136.8 132.0 253.7 247.4
Operating Segments | Building Materials Business West Group        
Segment Reporting Information [Line Items]        
Total revenues 682.5 651.7 1,193.1 1,149.2
Earnings (Loss) from operations 133.2 110.6 155.9 130.9
Operating Segments | Building Materials Business West Group | Products and Services        
Segment Reporting Information [Line Items]        
Total revenues 640.9 611.8 1,114.1 1,076.0
Operating Segments | Magnesia Specialties        
Segment Reporting Information [Line Items]        
Total revenues 53.6 76.3 119.3 150.3
Earnings (Loss) from operations 13.2 25.2 34.9 47.9
Operating Segments | Magnesia Specialties | Products and Services        
Segment Reporting Information [Line Items]        
Total revenues 48.9 70.4 108.8 139.5
Operating Segments | Building Materials Business        
Segment Reporting Information [Line Items]        
Total revenues 1,217.0 1,203.2 2,109.6 2,068.1
Corporate        
Segment Reporting Information [Line Items]        
Earnings (Loss) from operations $ (9.9) $ (23.9) $ (31.3) $ (49.4)