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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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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 |

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