v3.24.3
Goodwill and Intangible Assets
 9 Months Ended
Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
Goodwill
The following table sets forth the change in the carrying amount of goodwill during the nine months ended September 30, 2024 (in millions):
Balance as of December 31, 2023
$1,952.6 
Acquisitions135.9 
Translation and other adjustments(0.6)
Balance as of September 30, 2024
$2,087.9 
The changes in the carrying amount of goodwill for the nine months ended September 30, 2024 were driven primarily by the Company’s recent acquisitions. See Note 3 for additional information.
Intangible Assets
The amortizable intangible asset lives generally range from 1 to 20 years. The following table summarizes intangible assets by category (in millions, except time periods):
September 30,December 31,September 30,Weighted-Average Remaining
202420232023
Life1 (Years)
Amortizable intangible assets:
Customer relationships and other
$1,402.9 $1,238.9 $1,226.0 16.3
Trademarks4.5 5.6 4.5 0.1
Total amortizable intangible assets1,407.4 1,244.5 1,230.5 16.3
Accumulated amortization(918.4)(850.8)(829.8)
Total amortizable intangible assets, net489.0 393.7 400.7 
Indefinite-lived trademarks15.3 9.8 9.8 
Total intangibles, net$504.3 $403.5 $410.5 
1.As of September 30, 2024.
Amortization expense relating to the above-listed intangible assets for the three months ended September 30, 2024 and 2023 was $24.7 million and $21.4 million, respectively. Amortization expense relating to the above-listed intangible assets for the nine months ended September 30, 2024 and 2023 was $68.7 million and $65.1 million, respectively.
The following table summarizes the estimated future amortization expense for intangible assets (in millions):
Year Ending December 31,
 
2024 (October - December)$22.9 
202582.3 
202671.2 
202760.3 
202849.5 
Thereafter202.8 
Total future amortization expense$489.0