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Goodwill and Intangible Assets
 9 Months Ended
Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
The changes in the carrying amount of goodwill for the nine months ended September 30, 2025 were as follows:
Goodwill
Accumulated
Impairment
Losses
Total
Balance as of December 31, 2024
$218.1 $(32.5)$185.6 
Additions1.4 — 1.4 
Foreign currency fluctuations24.1 (2.8)21.3 
Balance as of September 30, 2025
$243.6 $(35.3)$208.3 
The balances of acquired intangible assets, excluding goodwill, were as follows:
Customer ListsTrade NamesTechnologyTotal
Balance as of September 30, 2025
Original cost$174.4 $31.0 $16.5 $221.9 
Accumulated amortization(125.3)(25.8)(14.9)(166.0)
Carrying value$49.1 $5.2 $1.6 $55.9 
Weighted average original life (in years)151111
Balance as of December 31, 2024
Original cost$154.6 $27.6 $15.2 $197.4 
Accumulated amortization(104.9)(20.8)(13.0)(138.7)
Carrying value$49.7 $6.8 $2.2 $58.7 
Weighted average original life (in years)151111
Amortization expense on intangible assets for the three and nine months ended September 30, 2025 was $3.4 million and $10.2 million, respectively. Amortization expense on intangible assets for the three and nine months ended September 30, 2024 was $3.6 million and $11.4 million, respectively.
Estimated aggregate amortization expense based on the current carrying value of amortizable intangible assets for each of the five succeeding years and thereafter is as follows:
Remaining 2025
$3.8 
202612.8 
20279.2 
20287.4 
20296.7 
Thereafter16.0 
Total$55.9