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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2022
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) |  | 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 |
|  | 2021 |
Balance at beginning of period |  | $ | 572.5 |  |  | $ | 1,841.5 |  |  | $ | 2,414.0 |
Acquisitions |  |  | 186.9 |  |  |  | 893.5 |  |  |  | 1,080.4 |
Balance at end of period |  | $ | 759.4 |  |  | $ | 2,735.0 |  |  | $ | 3,494.4 |
Intangible Assets Subject to Amortization | Intangible assets subject to amortization consist of the following:
December 31 |  | Gross Amount |  |  | Accumulated Amortization |  |  | Net Balance |
(in millions) |  | 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 |
|  | 2021 |
Noncompetition agreements |  | $ | 4.2 |  |  | $ | (4.1 | ) |  | $ | 0.1 |
Customer relationships |  |  | 425.3 |  |  |  | (49.2 | ) |  |  | 376.1 |
Operating permits |  |  | 697.3 |  |  |  | (56.6 | ) |  |  | 640.7 |
Use rights and other |  |  | 16.3 |  |  |  | (13.9 | ) |  |  | 2.4 |
Trade names |  |  | 23.3 |  |  |  | (13.6 | ) |  |  | 9.7 |
Total |  | $ | 1,166.4 |  |  | $ | (137.4 | ) |  | $ | 1,029.0 |
Intangible assets subject to amortization decreased in 2022 due to measurement period adjustments to acquisition-date fair values and the divestiture of the Company's Colorado and Central Texas ready mixed concrete businesses (see Note C).
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) |  | 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 |
|  | 2021 |
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 |
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) |  |  |
2023 |  | $ | 28.1 |
2024 |  |  | 28.0 |
2025 |  |  | 27.9 |
2026 |  |  | 26.6 |
2027 |  |  | 25.8 |
Thereafter |  |  | 675.6 |
Total |  | $ | 812.0 |

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