Summary of Significant Accounting Policies - Deferred Implementation Costs, Deferred Solution and Other Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Deferred Implementation Costs
Capitalized Contract Cost [Line Items]
Capitalization of implementation costs	$ 3.5	$ 3.4	$ 6.8	$ 6.8
Amortization of capitalized implementation costs	$ 2.9	2.4	$ 5.7	5.2
Deferred Implementation Costs | Minimum
Capitalized Contract Cost [Line Items]
Expected period of customer benefit	5 years		5 years
Deferred Implementation Costs | Maximum
Capitalized Contract Cost [Line Items]
Expected period of customer benefit	7 years		7 years
Deferred Commissions
Capitalized Contract Cost [Line Items]
Capitalization of implementation costs	$ 3.6	3.2	$ 8.0	6.3
Amortization of capitalized implementation costs	$ 2.5	$ 3.1	$ 5.4	$ 6.4
Deferred Commissions | Minimum
Capitalized Contract Cost [Line Items]
Expected period of customer benefit	5 years		5 years
Deferred Commissions | Maximum
Capitalized Contract Cost [Line Items]
Expected period of customer benefit	7 years		7 years