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Intangible Assets
 12 Months Ended
Dec. 31, 2024
Intangible Assets Abstract  
Intangible Assets INTANGIBLE ASSETS
The following table sets forth the gross amount and related accumulated amortization of the Company's intangible assets at December 31:
20242023
In millionsGross carrying amountAccumulated amortizationNet carrying amountGross carrying amountAccumulated amortizationNet carrying amount
Customer relationships$2,418.4 $(1,875.4)$543.0 $2,384.4 $(1,731.4)$653.0 
Other423.1 (267.1)156.0 419.6 (243.1)176.5 
Total finite-lived intangible assets$2,841.5 $(2,142.5)$699.0 $2,804.0 $(1,974.5)$829.5 
Trademarks (indefinite-lived)2,609.2 — 2,609.2 2,610.3 — 2,610.3 
Total$5,450.7 $(2,142.5)$3,308.2 $5,414.3 $(1,974.5)$3,439.8 
Intangible asset amortization expense for 2024, 2023 and 2022 was $180.7 million, $165.2 million and $142.7 million, respectively.
Future estimated amortization expense on existing intangible assets in the next five years as of December 31, 2024 amounts to approximately:
In millions
2025$156 
2026102 
202773 
202854 
202952