Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2021

Goodwill And Intangible Assets Disclosure [Abstract]

Changes in Goodwill

The following table shows the changes in goodwill by reportable segment and in total:

December 31	East Group			West Group			Total
(in millions)	2021
Balance at beginning of period	$	572.5		$	1,841.5		$	2,414.0
Acquisitions		186.9			893.5			1,080.4
Balance at end of period	$	759.4		$	2,735.0		$	3,494.4
	2020
Balance at beginning of period	$	574.3		$	1,822.5		$	2,396.8
Acquisitions		—			17.3			17.3
Goodwill reclassified from/(allocated to) assets held for sale		0.1			(0.1	)		—
Divestitures		—			(0.1	)		(0.1	)
Transfer of operations from East Group to West Group		(1.9	)		1.9			—
Balance at end of period	$	572.5		$	1,841.5		$	2,414.0

Intangible Assets Subject to Amortization

Intangible assets subject to amortization consist of the following:

December 31	Gross Amount		Accumulated Amortization			Net Balance
(in millions)	2021
Noncompetition agreements	$	4.2	$	(4.1	)	$	0.1
Customer relationships		425.3		(49.2	)		376.1
Operating permits		697.3		(56.6	)		640.7
Use rights and other		16.3		(13.9	)		2.4
Trade names		23.3		(13.6	)		9.7
Total	$	1,166.4	$	(137.4	)	$	1,029.0
	2020
Noncompetition agreements	$	4.2	$	(4.1	)	$	0.1
Customer relationships		91.3		(35.6	)		55.7
Operating permits		460.8		(48.4	)		412.4
Use rights and other		16.3		(13.0	)		3.3
Trade names		12.8		(12.3	)		0.5
Total	$	585.4	$	(113.4	)	$	472.0

Intangible Assets Deemed to Indefinite Life that are Therefore Not Amortized

Intangible assets deemed to have an indefinite life that are therefore not amortized consist of the following as of December 31, 2021 and 2020:

(in millions)	Building Materials Business		Magnesia Specialties		Total
Operating permits	$	6.6	$	—	$	6.6
Use rights		26.7		—		26.7
Trade names		0.2		2.5		2.7
Total	$	33.5	$	2.5	$	36.0

Summary of Intangible Assets Acquired

During 2021, the Company acquired $845.9 million of intangible assets, of which $264.9 million were classified as held for sale as of December 31, 2021 (see Note D). Excluding the intangible assets classified as held for sale, acquired intangible assets consist of the following:

(in millions, except year data)	Amount		Weighted-average amortization period
Subject to amortization:
Customer relationships	$	334.0	25 years
Trade name		10.5	9 years
Operating permits		236.5	40 years
Total subject to amortization	$	581.0	31 years

Estimated Amortization Expense of Intangible Assets

The estimated amortization expense for intangible assets for each of the next five years and thereafter is as follows:

(in millions)
2022	$	34.1
2023		33.8
2024		33.6
2025		33.4
2026		31.9
Thereafter		862.2
Total	$	1,029.0