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Goodwill and Intangibles
 3 Months Ended
Mar. 31, 2025
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):
InstallationOtherConsolidated
Goodwill (gross) - January 1, 2025$401.9 $100.7 $502.6 
Business combinations2.8 — 2.8 
Other adjustments0.2 — 0.2 
Goodwill (gross) - March 31, 2025404.9 100.7 505.6 
Accumulated impairment losses (70.0)— (70.0)
Goodwill (net) - March 31, 2025$334.9 $100.7 $435.6 
We test goodwill for impairment annually during the fourth quarter of our fiscal year or earlier if there is an impairment indicator. The accumulated impairment losses included within the above table were all associated with the Installation segment and substantially all of the impairment losses were recorded prior to 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,
 20252024
 Gross
Carrying
Amount		Accumulated
Amortization		Net
Book
Value		Gross
Carrying
Amount		Accumulated
Amortization		Net
Book
Value
Amortized intangibles:      
Customer relationships$390.8 $214.6 $176.2 $386.4 $207.6 $178.8 
Covenants not-to-compete34.8 28.0 6.8 34.6 27.1 7.5 
Trademarks and tradenames141.2 57.5 83.7 139.5 55.3 84.2 
Backlog21.8 21.6 0.2 21.6 21.6 — 
Total intangibles$588.6 $321.7 $266.9 $582.1 $311.6 $270.5 
The gross carrying amount of intangibles increased $6.5 million during the three months ended March 31, 2025 primarily due to business combinations. For more information on business combinations, 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 2025$29.6 
202635.6 
202731.3 
202828.0 
202925.2 
Thereafter117.2