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Revenue
 12 Months Ended
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]  
Revenue Revenue
Our sales rebates and discounts are based on specific agreements and the majority relate to sales in the U.S. As of December 31, 2019 and 2018, the liability for sales rebates and discounts in the U.S. represents approximately 71% and 70%, respectively, of our total liability with the next largest country representing approximately 8% of our total liability for 2019 and 2018.
The following table summarizes the activity in the sales rebates and discounts liability in the U.S.:
Year Ended December 31,
20192018
Beginning balance$118.5  $114.8  
Reduction of revenue316.3  221.0  
Payments(284.4) (217.3) 
Ending balance$150.4  $118.5  
Adjustments to revenue recognized as a result of changes in estimates for the judgments described above during the years ended December 31, 2019 and 2018 for product shipped in previous periods were not material.
Actual product returns were 0.2% and 0.6% of net revenue for the years ended December 31, 2019 and 2018, respectively, and have not fluctuated significantly as a percentage of revenue.
Disaggregation of Revenue
The following table summarizes our revenue disaggregated by product category for the years ended December 31:
201920182017
Companion Animal Disease Prevention$787.9  $804.6  $660.2  
Companion Animal Therapeutics348.0  283.1  260.8  
Food Animal Future Protein & Health745.1  711.2  649.2  
Food Animal Ruminants Swine1,110.3  1,174.0  1,175.0  
Strategic Exits(1)
79.7  93.9  143.8  
Total Revenue$3,071.0  $3,066.8  $2,889.0  
(1) Represents revenue from business activities we have either exited or made a strategic decision to exit.