Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2021

Revenue From Contract With Customer [Abstract]

Schedule of Company's Total Revenues by Category for each Reportable Segment

The following table presents the Company’s total revenues by category for each reportable segment:

years ended December 31	Products and Services		Freight		Total
(in millions)	2021
East Group	$	2,161.6	$	141.4	$	2,303.0
West Group		2,648.4		163.9		2,812.3
Total Building Materials business		4,810.0		305.3		5,115.3
Magnesia Specialties		274.7		24.0		298.7
Total	$	5,084.7	$	329.3	$	5,414.0
	2020
East Group	$	1,826.6	$	122.5	$	1,949.1
West Group		2,384.6		153.5		2,538.1
Total Building Materials business		4,211.2		276.0		4,487.2
Magnesia Specialties		220.9		21.8		242.7
Total	$	4,432.1	$	297.8		4,729.9
	2019
East Group	$	1,814.5	$	134.5	$	1,949.0
West Group		2,357.9		160.9		2,518.8
Total Building Materials business		4,172.4		295.4		4,467.8
Magnesia Specialties		249.9		21.4		271.3
Total	$	4,422.3	$	316.8	$	4,739.1

Summary of Information About the Company's Contract Balances

The following table presents information about the Company’s contract balances:

December 31
(in millions)	2021		2020
Costs in excess of billings	$	4.3	$	2.2
Billings in excess of costs	$	7.8	$	14.0