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REVENUE FROM CONTRACTS WITH CUSTOMERS
 12 Months Ended
Dec. 31, 2023
Revenue from Contract with Customer [Abstract]  
REVENUE FROM CONTRACTS WITH CUSTOMERS REVENUE FROM CONTRACTS WITH CUSTOMERS
Disaggregation of Revenue
Revenue by Geographic Area
The table below presents our consolidated sales by geographic area. Net sales attributed to geographic areas were based on the location of the customer.
Years ended December 31,
In millions202320222021
United States$746.5 $720.5 $619.6 
Other international881.6 841.6 819.2 
Total net sales$1,628.1 $1,562.1 $1,438.8 
Revenue by Product Category
The table below presents our consolidated sales by product category.
Years ended December 31,
In millions202320222021
Fuel$705.2 $674.7 $612.6 
Lube305.4 306.9 278.7 
Air282.4 267.8 242.9 
Other335.1 312.7 304.6 
Total net sales$1,628.1 $1,562.1 $1,438.8 
Revenue by Major Customer
Related party sales to Cummins represented 17.4% of net sales in 2023 ($282.5 million), 19.3% of net sales in 2022 ($302.2 million) and 18.5% of net sales in 2021 ($266.8 million). For the years ended December 31, 2023, 2022 and 2021, two external customers, PACCAR and the Traton Group, each represented greater than 10% of our annual net sales. These customers represented 15.6% and 11.8% of net sales in 2023, 16.2% and 12.0% of net sales in 2022 and 15.1% and 11.7% of net sales in 2021. No other customers exceeded 10% of net sales in the three years presented.