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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Disaggregation of Revenue [Line Items]          
Deferred revenue contract liability $ 31.7   $ 31.7   $ 39.0
Revenue recognized from deferred     24.8    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01          
Disaggregation of Revenue [Line Items]          
Revenue, remaining performance obligation, amount $ 24.8   $ 24.8    
Revenue, remaining performance obligation, expected timing of satisfaction, period 12 months   12 months    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-10-01          
Disaggregation of Revenue [Line Items]          
Revenue, remaining performance obligation, amount $ 6.9   $ 6.9    
Revenue, remaining performance obligation, expected timing of satisfaction, period 5 years   5 years    
Sales Revenue | Product Concentration Risk          
Disaggregation of Revenue [Line Items]          
Concentration risk, percentage 100.00% 100.00% 100.00% 100.00%  
Contracts with Customers | Sales Revenue | Product Concentration Risk          
Disaggregation of Revenue [Line Items]          
Concentration risk, percentage     84.00% 85.00%  
Derivatives, Cross-Border Payments Business | Sales Revenue | Product Concentration Risk          
Disaggregation of Revenue [Line Items]          
Concentration risk, percentage     9.00% 8.00%  
Late Fees and Finance Charges | Sales Revenue | Product Concentration Risk          
Disaggregation of Revenue [Line Items]          
Concentration risk, percentage     4.00% 4.00%  
Float Revenue Earned On Invested Funds | Sales Revenue | Product Concentration Risk          
Disaggregation of Revenue [Line Items]          
Concentration risk, percentage     3.00% 3.00%