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Intangible Assets
 9 Months Ended
Sep. 30, 2024
Intangible Assets Abstract  
Intangible Assets Intangible Assets
The gross amount of the Company’s intangible assets and related accumulated amortization were as follows:
September 30, 2024December 31, 2023
In millionsGross carrying amountAccumulated amortizationNet carrying amountGross carrying amountAccumulated amortizationNet carrying amount
Customer relationships$2,437.0 $(1,848.0)$589.0 $2,384.4 $(1,731.4)$653.0 
Other438.5 (264.9)173.6 419.6 (243.1)176.5 
Total finite-lived intangible assets2,875.5 (2,112.9)762.6 2,804.0 (1,974.5)829.5 
Trademarks (indefinite-lived)2,602.0 — 2,602.0 2,610.3 — 2,610.3 
Total$5,477.5 $(2,112.9)$3,364.6 $5,414.3 $(1,974.5)$3,439.8 
Intangible asset amortization expense was $45.3 million and $45.4 million for the three months ended September 30, 2024 and 2023, respectively. Intangible asset amortization expense was $135.0 million and $122.4 million for the nine months ended September 30, 2024 and 2023, respectively.