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Capitalized Software Development Cost, net - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Research and Development [Abstract]        
Capitalized software development costs $ 7.0 $ 7.1 $ 14.1 $ 13.8
Amortization expense $ 5.3 $ 4.5 $ 10.3 $ 8.7