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Description of Business and Summary of Significant Accounting Policies (Advertising Costs) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Accounting Policies [Abstract]        
Advertising expense $ 0.8 $ 2.0 $ 3.4 $ 7.6