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Intangible Assets
 3 Months Ended
Mar. 31, 2025
Intangible Assets Abstract  
Intangible Assets Intangible Assets
The gross amount of the Company's intangible assets and related accumulated amortization were as follows:
March 31, 2025December 31, 2024
In millionsGross carrying amountAccumulated amortizationNet carrying amountGross carrying amountAccumulated amortizationNet carrying amount
Customer relationships$2,432.8 $(1,919.1)$513.7 $2,418.4 $(1,875.4)$543.0 
Other494.2 (277.0)217.2 423.1 (267.1)156.0 
Total finite-lived intangible assets2,927.0 (2,196.1)730.9 2,841.5 (2,142.5)699.0 
Trademarks (indefinite-lived)2,609.4 — 2,609.4 2,609.2 — 2,609.2 
Total$5,536.4 $(2,196.1)$3,340.3 $5,450.7 $(2,142.5)$3,308.2 
Intangible asset amortization expense was $47.1 million and $44.9 million for the three months ended March 31, 2025 and 2024, respectively.