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Goodwill and Intangibles (Tables)
3 Months Ended
Mar. 31, 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):
InstallationOtherConsolidated
Goodwill (gross) - January 1, 2024$375.2 $93.6 $468.8 
Business combinations1.5 — 1.5 
Other adjustments0.1 — 0.1 
Goodwill (gross) - March 31, 2024376.8 93.6 470.4 
Accumulated impairment losses (70.0)— (70.0)
Goodwill (net) - March 31, 2024$306.8 $93.6 $400.4 
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 March 31,As of December 31,
 20242023
 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-compete32.3 24.6 7.7 32.1 23.7 8.4 
Trademarks and tradenames128.6 49.5 79.1 128.0 47.4 80.6 
Backlog21.6 21.6 — 21.6 21.5 0.1 
 $541.6 $281.1 $260.5 $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$30.7 
202535.6 
202631.6 
202727.3 
202823.9 
Thereafter111.4