Business Segments - Financial Data for Continuing Operations for Company's Reportable Business Segments (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Total Revenues	$ 1,811.7	$ 1,557.3	$ 4,684.2	$ 3,917.6
Earnings (Loss) from operations	405.9	356.9	944.4	763.7
Products and Services
Segment Reporting Information [Line Items]
Total Revenues	1,680.5	1,462.7	4,352.1	3,679.9
Building Materials Business
Segment Reporting Information [Line Items]
Total Revenues	1,736.0	1,478.9	4,449.8	3,692.6
Earnings (Loss) from operations	399.1	356.4	955.2	749.5
Building Materials Business | Products and Services
Segment Reporting Information [Line Items]
Total Revenues	1,611.5	1,390.8	4,137.7	3,472.8
Operating Segments | Building Materials Business East Group
Segment Reporting Information [Line Items]
Total Revenues	773.6	684.1	1,866.9	1,714.4
Earnings (Loss) from operations	239.4	205.8	478.0	465.3
Operating Segments | Building Materials Business East Group | Products and Services
Segment Reporting Information [Line Items]
Total Revenues	728.5	641.8	1,755.5	1,610.9
Operating Segments | Building Materials Business West Group
Segment Reporting Information [Line Items]
Total Revenues	962.4	794.8	2,582.9	1,978.2
Earnings (Loss) from operations	159.7	150.6	477.2	284.2
Operating Segments | Building Materials Business West Group | Products and Services
Segment Reporting Information [Line Items]
Total Revenues	883.0	749.0	2,382.2	1,861.9
Operating Segments | Magnesia Specialties
Segment Reporting Information [Line Items]
Total Revenues	75.7	78.4	234.4	225.0
Earnings (Loss) from operations	16.5	23.1	58.4	69.8
Operating Segments | Magnesia Specialties | Products and Services
Segment Reporting Information [Line Items]
Total Revenues	69.0	71.9	214.4	207.1
Operating Segments | Building Materials Business
Segment Reporting Information [Line Items]
Total Revenues	1,736.0	1,478.9	4,449.8	3,692.6
Corporate
Segment Reporting Information [Line Items]
Earnings (Loss) from operations	$ (9.7)	$ (22.6)	$ (69.2)	$ (55.6)