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Goodwill and Other Intangibles (Tables)

6 Months Ended

Jun. 30, 2021

Goodwill And Intangible Assets Disclosure [Abstract]

Changes in Goodwill

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

		East				West
		Group				Group				Total
		(Dollars in Millions)
Balance at January 1, 2021		$	572.5			$	1,841.5			$	2,414.0
Acquisitions			185.6				—				185.6
Balance at June 30, 2021		$	758.1			$	1,841.5			$	2,599.6

Intangible Assets Subject to Amortization

Intangible assets subject to amortization consist of the following:

		Gross Amount				Accumulated Amortization				Net Balance
(Dollars in Millions)		June 30, 2021
Noncompetition agreements		$	4.2			$	(4.1	)		$	0.1
Customer relationships			306.7				(40.2	)			266.5
Operating permits			460.8				(51.5	)			409.3
Use rights and other			16.4				(13.6	)			2.8
Trade names			23.3				(13.0	)			10.3
Total		$	811.4			$	(122.4	)		$	689.0
		December 31, 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 and Not Being Amortized

At June 30, 2021 and December 31, 2020, intangible assets deemed to have an indefinite life and not being amortized consist of the following:

(Dollars 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

For the six months ended June 30, 2021, the Company acquired $225.9 million of intangibles, which consists of the following:

(Dollars in Millions)		Amount				Weighted-average amortization period
Subject to amortization:
Customer relationships		$	215.4			25 years
Trade name			10.5			9 years
Total		$	225.9			24 years

Estimated Amortization Expense of Intangibles

The estimated amortization expense for intangibles for the second half of 2021 and for each of the next four years and thereafter is as follows:

(Dollars in Millions)
July - December 2021		$	11.8
2022			22.9
2023			22.7
2024			22.3
2025			22.2
Thereafter			587.1
Total		$	689.0

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