Summary of Significant Accounting Policies - Deferred Implementation Costs, Deferred Solution and Other Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Deferred Implementation Costs
Capitalized Contract Cost [Line Items]
Capitalization of implementation costs	$ 11.9	$ 16.9
Amortization of capitalized implementation costs	11.9	14.5
Deferred Commissions
Capitalized Contract Cost [Line Items]
Capitalization of implementation costs	10.5	15.0
Amortization of capitalized implementation costs	$ 12.6	$ 8.5
Minimum
Capitalized Contract Cost [Line Items]
Expected period of customer benefit	5 years
Minimum | Deferred Commissions
Capitalized Contract Cost [Line Items]
Expected period of customer benefit	5 years
Maximum
Capitalized Contract Cost [Line Items]
Expected period of customer benefit	7 years
Maximum | Deferred Commissions
Capitalized Contract Cost [Line Items]
Expected period of customer benefit	7 years