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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Total Revenues	$ 1,641.7	$ 1,377.9	$ 2,872.5	$ 2,360.3
Earnings (Loss) from operations	478.6	307.5	538.4	406.8
Products and Services
Segment Reporting Information [Line Items]
Total Revenues	1,523.8	1,295.3	2,671.6	2,217.2
Building Materials Business
Segment Reporting Information [Line Items]
Total Revenues	1,560.0	1,302.1	2,713.8	2,213.6
Earnings (Loss) from operations	485.1	299.6	556.1	393.1
Building Materials Business | Products and Services
Segment Reporting Information [Line Items]
Total Revenues	1,449.2	1,225.3	2,526.2	2,082.0
Operating Segments | Building Materials Business East Group
Segment Reporting Information [Line Items]
Total Revenues	674.5	635.3	1,093.3	1,030.2
Earnings (Loss) from operations	210.6	197.8	238.5	259.5
Operating Segments | Building Materials Business East Group | Products and Services
Segment Reporting Information [Line Items]
Total Revenues	632.4	596.5	1,027.0	969.1
Operating Segments | Building Materials Business West Group
Segment Reporting Information [Line Items]
Total Revenues	885.5	666.8	1,620.5	1,183.4
Earnings (Loss) from operations	274.5	101.8	317.6	133.6
Operating Segments | Building Materials Business West Group | Products and Services
Segment Reporting Information [Line Items]
Total Revenues	816.8	628.8	1,499.2	1,112.9
Operating Segments | Magnesia Specialties
Segment Reporting Information [Line Items]
Total Revenues	81.7	75.8	158.7	146.7
Earnings (Loss) from operations	20.3	23.1	41.8	46.7
Operating Segments | Magnesia Specialties | Products and Services
Segment Reporting Information [Line Items]
Total Revenues	74.6	70.0	145.4	135.2
Operating Segments | Building Materials Business
Segment Reporting Information [Line Items]
Total Revenues	1,560.0	1,302.1	2,713.8	2,213.6
Corporate
Segment Reporting Information [Line Items]
Earnings (Loss) from operations	$ (26.8)	$ (15.2)	$ (59.5)	$ (33.0)