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Goodwill and Intangibles | 3 Months Ended
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Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangibles | GOODWILL AND INTANGIBLES Goodwill The change in carrying amount of goodwill by reporting segment was as follows (in millions):
| Installation |  | Other |  | Consolidated
Goodwill (gross) - January 1, 2024 | $ | 375.2 |  |  | $ | 93.6 |  |  | $ | 468.8 |
Business combinations | 1.5 |  |  | — |  |  | 1.5 |
Other adjustments | 0.1 |  |  | — |  |  | 0.1 |
Goodwill (gross) - March 31, 2024 | 376.8 |  |  | 93.6 |  |  | 470.4 |
Accumulated impairment losses | (70.0) |  |  | — |  |  | (70.0) |
Goodwill (net) - March 31, 2024 | $ | 306.8 |  |  | $ | 93.6 |  |  | $ | 400.4 |
Other adjustments presented in the above table primarily include one immaterial acquisition and adjustments for the allocation of certain acquisitions still under measurement made during the three months ended March 31, 2024. We test goodwill for impairment annually during the fourth quarter of our fiscal year or earlier if there is an impairment indicator. Accumulated impairment losses included within the above table were incurred over multiple periods and were all associated with the Installation segment, with the latest impairment charge being recorded during the year ended December 31, 2010. Intangibles, net The following table provides the gross carrying amount, accumulated amortization and net book value for each major class of intangibles (in millions):
| As of March 31, |  | As of December 31,
| 2024 |  | 2023
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value
Amortized intangibles: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | $ | 359.1 |  |  | $ | 185.4 |  |  | $ | 173.7 |  |  | $ | 357.4 |  |  | $ | 177.8 |  |  | $ | 179.6 |
Covenants not-to-compete | 32.3 |  |  | 24.6 |  |  | 7.7 |  |  | 32.1 |  |  | 23.7 |  |  | 8.4 |
Trademarks and tradenames | 128.6 |  |  | 49.5 |  |  | 79.1 |  |  | 128.0 |  |  | 47.4 |  |  | 80.6 |
Backlog | 21.6 |  |  | 21.6 |  |  | — |  |  | 21.6 |  |  | 21.5 |  |  | 0.1 |
| $ | 541.6 |  |  | $ | 281.1 |  |  | $ | 260.5 |  |  | $ | 539.1 |  |  | $ | 270.4 |  |  | $ | 268.7 |
The gross carrying amount of intangibles increased approximately $2.5 million during the three months ended March 31, 2024 primarily due to business combinations. For more information, see Note 17, Business Combinations. Remaining estimated aggregate annual amortization expense is as follows (amounts, in millions, are for the fiscal year ended):
Remainder of 2024 | $ | 30.7 |
2025 | 35.6 |
2026 | 31.6 |
2027 | 27.3 |
2028 | 23.9 |
Thereafter | 111.4 |

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