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Operations and Summary of Significant Accounting Policies - Research and Development and Advertisting Costs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Product and Software Research and Development Costs      
Product Research and Development Costs $ 10.9 $ 10.8 $ 10.6
Selling Costs      
Advertising expenses $ 7.9 $ 7.6 $ 9.6