Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2019

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	Mid- America Group			Southeast Group			West Group			Total
(in millions)	2019
Balance at beginning of period	$	431.9		$	144.2		$	1,823.0		$	2,399.1
Measurement period adjustments		(1.0	)		(0.6	)		—			(1.6	)
Goodwill allocated to assets held for sale		—			(0.2	)		—			(0.2	)
Divestitures		—			—			(0.5	)		(0.5	)
Balance at end of period	$	430.9		$	143.4		$	1,822.5		$	2,396.8
	2018
Balance at beginning of period	$	281.4		$	50.3		$	1,828.6		$	2,160.3
Acquisitions		150.5			94.8			—			245.3
Goodwill allocated to assets held for sale		—			—			(5.6	)		(5.6	)
Divestitures		—			(0.9	)		—			(0.9	)
Balance at end of period	$	431.9		$	144.2		$	1,823.0		$	2,399.1

Intangible assets subject to amortization consist of the following:

December 31	Gross Amount		Accumulated Amortization			Net Balance
(in millions)	2019
Noncompetition agreements	$	6.3	$	(6.2	)	$	0.1
Customer relationships		65.6		(30.4	)		35.2
Operating permits		459.0		(42.3	)		416.7
Use rights and other		16.7		(12.1	)		4.6
Trade names		12.8		(10.9	)		1.9
Total	$	560.4	$	(101.9	)	$	458.5
	2018
Noncompetition agreements	$	6.3	$	(6.2	)	$	0.1
Customer relationships		65.6		(25.6	)		40.0
Operating permits		459.0		(36.1	)		422.9
Use rights and other		16.7		(11.2	)		5.5
Trade names		12.8		(9.7	)		3.1
Total	$	560.4	$	(88.8	)	$	471.6

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)	2019
Operating permits	$	6.6	$	—	$	6.6
Use rights		19.0		—		19.0
Trade names		0.2		2.5		2.7
Total	$	25.8	$	2.5	$	28.3
	2018
Operating permits	$	6.6	$	—	$	6.6
Use rights		20.3		—		20.3
Trade names		0.3		2.5		2.8
Total	$	27.2	$	2.5	$	29.7

During 2019, the Company acquired $1.5 million of intangible assets, consisting of use rights not subject to amortization.

Total amortization expense for intangible assets for the years ended December 31, 2019, 2018 and 2017 was $13.0 million, $13.9 million and $14.2 million, respectively.

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

(in millions)
2020	$	13.2
2021		12.5
2022		11.1
2023		10.6
2024		10.6
Thereafter		400.5
Total	$	458.5