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Hosting Arrangements (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]          
Hosting arrangements, Capitalized costs $ 10.8   $ 10.8   $ 7.7
Hosting arrangements, Accumulated amortization 0.6   0.6   $ 0.3
Hosting arrangements, Amortization $ 0.1 $ 0.1 $ 0.3 $ 0.2  
Impairment of capitalized implementation costs   $ 1.6   $ 1.6