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Inventory - Schedule of Inventory (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Inventory [Line Items]    
Total inventory $ 8.4 $ 8.5
Point-of-Sale Systems and Components    
Inventory [Line Items]    
Total inventory 2.7 2.6
Terminal Systems and Components    
Inventory [Line Items]    
Total inventory $ 5.7 $ 5.9