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Goodwill and Other Intangible Assets | 12 Months Ended
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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 |
A mortization 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 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350/tableOfContent + Details
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