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Goodwill and Intangibles
 12 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangibles GOODWILL AND INTANGIBLES
Goodwill
The change in carrying amount of goodwill by reporting segment for the year ended December 31, 2022 was as follows (in millions):
InstallationOtherConsolidated
Goodwill (gross) - January 1, 2022$331.8 $60.7 $392.5 
Business combinations21.7 27.6 49.3 
Other adjustments1.8 — 1.8 
Goodwill (gross) - December 31, 2022355.3 88.3 443.6 
Accumulated impairment losses (70.0)— (70.0)
Goodwill (net) - December 31, 2022$285.3 $88.3 $373.6 
The change in carrying amount of goodwill by reporting segment for the year ended December 31, 2023 was as follows (in millions):
InstallationOtherConsolidated
Goodwill (gross) - January 1, 2023$355.3 $88.3 $443.6 
Business combinations20.8 — 20.8 
Other adjustments(0.9)5.3 4.4 
Goodwill (gross) - December 31, 2023375.2 93.6 468.8 
Accumulated impairment losses(70.0)— (70.0)
Goodwill (net) - December 31, 2023$305.2 $93.6 $398.8 
Other adjustments in the above table for the year ended December 31, 2023 for the Other category primarily include measurement period adjustments associated with a tax election that resulted in a $4.5 million change in purchase price for a 2022 acquisition.
Other adjustments for the Installation segment included in the above table for the year ended December 31, 2022 include an adjustment to a prior year acquisition still within its measurement period of approximately $1.6 million. We also made other minor adjustments for the allocation of certain acquisitions still under measurement which are included as other additions in the above table for the Installation segment for the years ended December 31, 2023 and 2022. For additional information regarding changes to goodwill resulting from acquisitions, see Note 18, Business Combinations.
On October 1, 2023, our measurement date, we tested goodwill for impairment by reporting unit. We have the option to either assess goodwill for impairment by performing a qualitative assessment to determine whether it is more likely than not that the fair value is less than its carrying value, or to bypass the qualitative evaluation and perform a quantitative assessment. For the Manufacturing reporting unit, we performed a qualitative assessment in conformity with generally accepted accounting principles and determined that no impairment of goodwill was required. For our Installation and Distribution reporting units, we elected to perform individual quantitative assessments. These assessments approximated the fair value of the Installation and Distribution reporting units by weighting a discounted cash flow model and a market-related model in consultation with an external valuation expert. Upon comparison of the calculated fair value to the carrying value of the reporting units, it was determined no impairment of goodwill needed to be recognized for the year ended December 31, 2023. In addition, no impairment of goodwill was recognized for the years ended December 31, 2022 or 2021. Accumulated impairment losses included within the above table were incurred over multiple periods, with the latest impairment charge being recorded during the year ended December 31, 2010. These accumulated losses were assigned to our Installation reporting unit.
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 December 31,
20232022
Gross
Carrying
Amount		Accumulated
Amortization		Net
Book
Value		Gross
Carrying
Amount		Accumulated
Amortization		Net
Book
Value
Amortized intangibles:
Customer relationships$357.4 $177.8 $179.6 $338.0 $145.7 $192.3 
Covenants not-to-compete32.1 23.7 8.4 30.9 20.1 10.8 
Trademarks and tradenames128.0 47.4 80.6 119.6 39.6 80.0 
Backlog21.6 21.5 0.1 20.8 20.5 0.3 
Total intangibles$539.1 $270.4 $268.7 $509.3 $225.9 $283.4 
We recorded no intangible asset impairment loss for the years ended December 31, 2023, 2022 and 2021.
The gross carrying amount of intangibles increased approximately $29.8 million and $62.8 million during the years ended December 31, 2023 and 2022, respectively. Intangibles associated with business combinations accounted for approximately
$29.7 million and $65.1 million of the increases during the years ended December 31, 2023 and 2022, respectively. For the year ended December 31, 2022, there was a measurement period adjustment for a prior year acquisition that decreased gross intangibles by $3.0 million. For more information, see Note 18, Business Combinations. Amortization expense on intangible assets totaled approximately $44.5 million, $43.8 million, and $37.1 million during the years ended December 31, 2023, 2022 and 2021, respectively. Remaining estimated aggregate annual amortization expense is as follows (in millions):
2024$40.9 
202535.4 
202631.4 
202727.1 
202823.7 
Thereafter110.2