Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2023

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)	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

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 Indefinite Life that are Therefore Not Amortized

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

A

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