Revenue - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Deferred revenue contract liability	$ 45.7	$ 57.7
Revenue recognized from deferred	36.4
Deferred customer incentive payments	10.0	9.5
Prepaid Expenses
Disaggregation of Revenue [Line Items]
Capitalized contract cost	19.2	17.1
Other Assets
Disaggregation of Revenue [Line Items]
Capitalized contract cost	44.9	42.9
Selling Expense
Disaggregation of Revenue [Line Items]
Capitalized contract cost amortization	16.7	15.4	$ 16.0
Processing Expense
Disaggregation of Revenue [Line Items]
Cost of equipment and card sales	76.3	$ 83.1	$ 76.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, amount	$ 31.9
Revenue, remaining performance obligation, expected timing of satisfaction, period	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, amount	$ 13.8
Revenue, remaining performance obligation, expected timing of satisfaction, period	5 years
Minimum
Disaggregation of Revenue [Line Items]
Threshold period past due when Company ceases billing and accruing late fees	30 days
Capitalized contract cost amortization period (in years)	5 years
Maximum
Disaggregation of Revenue [Line Items]
Threshold period past due when Company ceases billing and accruing late fees	40 days
Term of derivative contract	1 year
Capitalized contract cost amortization period (in years)	10 years
Sales Revenue, Net | Late Fees And Finance Charges | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	5.00%	5.00%
Sales Revenue, Net | Derivatives, Cross-Border Payments | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	8.00%	8.00%
Sales Revenue, Net | Contracts with Customers | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	85.00%	87.00%
Sales Revenue, Net | Float Revenue Earned On Invested Funds | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	2.00%