Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

Note C: Goodwill and Other Intangible Assets

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

December 31	East Group		West Group			Total
(in millions)	2023
Balance at beginning of period	$	764.4	$	2,885.1		$	3,649.5
Goodwill allocated to assets held for sale		—		(260.0	)		(260.0	)
Balance at end of period	$	764.4	$	2,625.1		$	3,389.5
	2022
Balance at beginning of period	$	759.4	$	2,735.0		$	3,494.4
Acquisitions		—		3.7			3.7
Goodwill reclassified from assets held for sale		—		8.1			8.1
Divestitures		—		(159.7	)		(159.7	)
Measurement period adjustments		5.0		298.0			303.0
Balance at end of period	$	764.4	$	2,885.1		$	3,649.5

Intangible assets subject to amortization consist of the following:

December 31	Gross Amount		Accumulated Amortization			Net Balance
(in millions)	2023
Noncompetition agreements	$	4.1	$	(4.1	)	$	—
Customer relationships		421.0		(79.9	)		341.1
Operating permits		369.2		(55.8	)		313.4
Use rights and other		14.2		(12.5	)		1.7
Trade names		23.3		(15.9	)		7.4
Total	$	831.8	$	(168.2	)	$	663.6
	2022
Noncompetition agreements	$	4.1	$	(4.0	)	$	0.1
Customer relationships		423.7		(62.7	)		361.0
Operating permits		502.2		(61.4	)		440.8
Use rights and other		13.9		(12.4	)		1.5
Trade names		23.3		(14.7	)		8.6
Total	$	967.2	$	(155.2	)	$	812.0

Intangible assets deemed to have an indefinite life that are therefore not amortized consist of the following:

December 31	Building Materials Business		Magnesia Specialties		Total
(in millions)	2023
Operating permits	$	6.6	$	—	$	6.6
Use rights		25.0		—		25.0
Trade names		—		2.5		2.5
Total	$	31.6	$	2.5	$	34.1
	2022
Operating permits	$	6.6	$	—	$	6.6
Use rights		26.7		—		26.7
Trade names		—		2.5		2.5
Total	$	33.3	$	2.5	$	35.8

Amortization expense for intangible assets for the years ended December 31, 2023, 2022 and 2021 was $27.8 million, $26.6 million and $24.0 million, respectively. The intangible assets with finite lives classified as held for sale are not being amortized.

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

(in millions)
2024	$	26.5
2025		26.4
2026		25.1
2027		24.5
2028		24.3
Thereafter		536.8
Total	$	663.6