Revenues and Gross Profit - Total Revenues and Gross Profit by Product Line (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Product Information [Line Items]
Total Revenues	$ 5,414.0	$ 4,729.9	$ 4,739.1
Gross profit (loss)	1,348.4	1,252.8	1,179.0
Interproduct Revenues
Product Information [Line Items]
Total Revenues	(403.0)	(294.4)	(265.5)
Corporate
Product Information [Line Items]
Gross profit (loss)	2.0	7.5	3.0
Building Materials Business
Product Information [Line Items]
Total Revenues	5,115.3	4,487.2	4,467.8
Gross profit (loss)	1,239.9	1,159.8	1,080.6
Building Materials Business | Operating Segments
Product Information [Line Items]
Total Revenues	5,115.3	4,487.2	4,467.8
Gross profit (loss)	1,239.9	1,159.8	1,080.6
Building Materials Business | Operating Segments | Products and Services
Product Information [Line Items]
Total Revenues	4,810.0	4,211.2	4,172.4
Gross profit (loss)	1,236.6	1,159.4	1,080.8
Magnesia Specialties | Operating Segments
Product Information [Line Items]
Total Revenues	298.7	242.7	271.3
Gross profit (loss)	106.5	85.5	95.4
Magnesia Specialties | Operating Segments | Products and Services
Product Information [Line Items]
Total Revenues	274.7	220.9	249.9
Gross profit (loss)	110.4	89.6	99.4
Aggregates | Building Materials Business | Operating Segments | Reportable Subsegments | Products and Services
Product Information [Line Items]
Total Revenues	3,058.5	2,769.3	2,756.7
Gross profit (loss)	904.8	848.5	807.9
Cement | Building Materials Business | Operating Segments | Reportable Subsegments | Products and Services
Product Information [Line Items]
Total Revenues	494.5	452.5	439.1
Gross profit (loss)	157.0	170.9	143.4
Ready Mixed Concrete | Building Materials Business | Operating Segments | Reportable Subsegments | Products and Services
Product Information [Line Items]
Total Revenues	1,145.8	952.1	948.1
Gross profit (loss)	95.6	79.6	78.8
Asphalt and Paving | Building Materials Business | Operating Segments | Reportable Subsegments | Products and Services
Product Information [Line Items]
Total Revenues	514.2	331.7	294.0
Gross profit (loss)	79.2	60.4	50.7
Freight
Product Information [Line Items]
Total Revenues	329.3	297.8	316.8
Freight | Building Materials Business
Product Information [Line Items]
Total Revenues	305.3	276.0	295.4
Freight | Building Materials Business | Operating Segments
Product Information [Line Items]
Total Revenues	305.3	276.0	295.4
Gross profit (loss)	3.3	0.4	(0.2)
Freight | Magnesia Specialties | Operating Segments
Product Information [Line Items]
Total Revenues	24.0	21.8	21.4
Gross profit (loss)	$ (3.9)	$ (4.1)	$ (4.0)