Revenues and Gross Profit - Total Revenues and Gross Profit (Loss) by Product Line (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Product Information [Line Items]
Total Revenues	$ 6,777.2	$ 6,160.7	$ 5,414.0
Gross profit (loss)	2,022.6	1,423.3	1,348.4
Interproduct Revenues
Product Information [Line Items]
Total Revenues	(461.7)	(383.4)	(403.7)
Corporate
Product Information [Line Items]
Gross profit (loss)	2.8	(5.8)	2.0
Building Materials Business | Operating Segments
Product Information [Line Items]
Total Revenues	6,461.8	5,856.7	5,115.3
Gross profit (loss)	1,922.7	1,338.2	1,239.9
Magnesia Specialties | Operating Segments
Product Information [Line Items]
Total Revenues	315.4	304.0	298.7
Gross profit (loss)	97.1	90.9	106.5
Aggregates | Building Materials Business | Operating Segments | Reportable Subsegments
Product Information [Line Items]
Total Revenues	4,301.6	3,879.0	3,344.3
Gross profit (loss)	1,378.1	983.8	907.6
Cement | Building Materials Business | Operating Segments | Reportable Subsegments
Product Information [Line Items]
Total Revenues	725.5	620.0	509.3
Gross profit (loss)	333.6	202.7	155.9
Ready Mixed Concrete | Building Materials Business | Operating Segments | Reportable Subsegments
Product Information [Line Items]
Total Revenues	1,009.3	953.2	1,147.5
Gross profit (loss)	102.0	70.7	96.5
Asphalt and Paving | Building Materials Business | Operating Segments | Reportable Subsegments
Product Information [Line Items]
Total Revenues	887.1	787.9	517.9
Gross profit (loss)	$ 109.0	$ 81.0	$ 79.9