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Goodwill and Other Intangible Assets
 12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets
The changes in the carrying amounts of goodwill by segment were as follows:
EIGEMGTotal
(In millions)
Balance at December 31, 2022$4,236.1 $1,136.5 $5,372.6 
Goodwill acquired79.3 932.4 1,011.7 
Purchase price allocation adjustments and other24.8 — 24.8 
Foreign currency translation adjustments24.8 13.7 38.5 
Balance at December 31, 20234,365.0 2,082.6 6,447.6 
Goodwill acquired70.7 — 70.7 
Purchase price allocation adjustments and other30.7 61.7 92.4 
Foreign currency translation adjustments(41.5)(13.3)(54.8)
Balance at December 31, 2024$4,424.9 $2,131.0 $6,555.9 
Other intangible assets were as follows at December 31:
20242023
(In thousands)
Definite-lived intangible assets (subject to amortization):
Patents$46,043 $47,239 
Purchased technology815,088 914,100 
Customer lists3,823,907 3,743,457 
4,685,038 4,704,796 
Accumulated amortization:
Patents(37,977)(38,105)
Purchased technology(378,102)(334,229)
Customer lists(1,377,094)(1,190,906)
(1,793,173)(1,563,240)
Net intangible assets subject to amortization2,891,865 3,141,556 
Indefinite-lived intangible assets (not subject to amortization):
Trademarks and trade names1,023,308 1,023,761 
$3,915,173 $4,165,317 
Amortization expense was $247.7 million, $215.1 million, and $205.8 million for the years ended December 31, 2024, 2023 and 2022, respectively. Amortization expense for each of the next five years is expected to approximate $256 million per year, not considering the impact of potential future acquisitions.