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Goodwill and Intangibles (Tables) | 9 Months Ended
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Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Change in Carrying Amount of 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 | 15.6 |  |  | 0.6 |  |  | 16.2 |
Other adjustments | 0.1 |  |  | — |  |  | 0.1 |
Goodwill (gross) - September 30, 2024 | 390.9 |  |  | 94.2 |  |  | 485.1 |
Accumulated impairment losses | (70.0) |  |  | — |  |  | (70.0) |
Goodwill (net) - September 30, 2024 | $ | 320.9 |  |  | $ | 94.2 |  |  | $ | 415.1 |
Schedule of Gross Carrying Amount, Accumulated Amortization and Net Book Value | The following table provides the gross carrying amount, accumulated amortization and net book value for each major class of intangibles (in millions):
| As of September 30, |  | 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 | $ | 369.4 |  |  | $ | 199.8 |  |  | $ | 169.6 |  |  | $ | 357.4 |  |  | $ | 177.8 |  |  | $ | 179.6 |
Covenants not-to-compete | 33.1 |  |  | 26.3 |  |  | 6.8 |  |  | 32.1 |  |  | 23.7 |  |  | 8.4 |
Trademarks and tradenames | 132.6 |  |  | 53.2 |  |  | 79.4 |  |  | 128.0 |  |  | 47.4 |  |  | 80.6 |
Backlog | 21.6 |  |  | 21.6 |  |  | — |  |  | 21.6 |  |  | 21.5 |  |  | 0.1 |
| $ | 556.7 |  |  | $ | 300.9 |  |  | $ | 255.8 |  |  | $ | 539.1 |  |  | $ | 270.4 |  |  | $ | 268.7 |
Schedule of Estimated Aggregate Annual Amortization | Remaining estimated aggregate annual amortization expense is as follows (amounts, in millions, are for the fiscal year ended):
Remainder of 2024 | $ | 10.4 |
2025 | 36.9 |
2026 | 32.9 |
2027 | 28.6 |
2028 | 25.2 |
Thereafter | 121.8 |

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