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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Deferred revenue contract liabilities	$ 43.4		$ 43.4		$ 45.7
Deferred revenue recognized			26.4
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01
Disaggregation of Revenue [Line Items]
Revenues to be recognized	$ 32.3		$ 32.3
Revenues to be recognized, period	12 months		12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01
Disaggregation of Revenue [Line Items]
Revenues to be recognized	$ 11.1		$ 11.1
Revenues to be recognized, period	5 years		5 years
Sales Revenue \| Product Concentration Risk
Disaggregation of Revenue [Line Items]
Revenues, net (percent)	100.00%	100.00%	100.00%	100.00%
Contracts with customers \| Sales Revenue \| Product Concentration Risk
Disaggregation of Revenue [Line Items]
Revenues, net (percent)			85.00%	85.00%
Late Fees and Finance Charges \| Sales Revenue \| Product Concentration Risk
Disaggregation of Revenue [Line Items]
Revenues, net (percent)			4.00%	5.00%
Derivatives, Cross-Border Payments Business \| Sales Revenue \| Product Concentration Risk
Disaggregation of Revenue [Line Items]
Revenues, net (percent)			8.00%	8.00%
Float Revenue Earned On Invested Funds \| Sales Revenue \| Product Concentration Risk
Disaggregation of Revenue [Line Items]
Revenues, net (percent)			3.00%	2.00%