v3.25.3
Intangible Assets
 9 Months Ended
Sep. 30, 2025
Intangible Assets Abstract  
Intangible Assets Intangible Assets
The gross amount of the Company's intangible assets and related accumulated amortization was as follows:
September 30, 2025December 31, 2024
In millionsGross carrying amountAccumulated amortizationNet carrying amountGross carrying amountAccumulated amortizationNet carrying amount
Customer relationships$2,450.5 $(1,992.5)$458.0 $2,418.4 $(1,875.4)$543.0 
Other503.9 (300.2)203.7 423.1 (267.1)156.0 
Total finite-lived intangible assets2,954.4 (2,292.7)661.7 2,841.5 (2,142.5)699.0 
Trademarks (indefinite-lived)2,609.7 — 2,609.7 2,609.2 — 2,609.2 
Total$5,564.1 $(2,292.7)$3,271.4 $5,450.7 $(2,142.5)$3,308.2 
Intangible asset amortization expense was $36.1 million and $45.3 million for the three months ended September 30, 2025 and 2024, respectively. Intangible asset amortization expense was $128.4 million and $135.0 million for the nine months ended September 30, 2025 and 2024, respectively.