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Summary of Significant Accounting Policies - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2025
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
Jun. 30, 2026
USD ($)
Jun. 30, 2025
Disaggregation of Revenue [Line Items]          
Deferred revenue contract liability $ 43.1 $ 29.7   $ 29.7  
Revenue recognized from deferred       33.4  
Losses on equity method investments       22.7  
Mastercard          
Disaggregation of Revenue [Line Items]          
Proceeds from sale of interest in cross-border payments business   300.0   $ 300.0  
Option to resell interest, period       6 months  
Annual compounded rate of return on minority interest repurchases       0.08  
Mastercard          
Disaggregation of Revenue [Line Items]          
Percentage of interests sold in cross-border payments business 0.023        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01          
Disaggregation of Revenue [Line Items]          
Revenue, remaining performance obligation, amount   $ 24.6   $ 24.6  
Revenue, remaining performance obligation, expected timing of satisfaction, period   12 months   12 months  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-07-01          
Disaggregation of Revenue [Line Items]          
Revenue, remaining performance obligation, amount   $ 5.1   $ 5.1  
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       78.00% 85.00%
Derivatives, Cross-Border Payments Business | Sales Revenue | Product Concentration Risk          
Disaggregation of Revenue [Line Items]          
Concentration risk, percentage       15.00% 8.00%
Late Fees and Finance Charges | Sales Revenue | Product Concentration Risk          
Disaggregation of Revenue [Line Items]          
Concentration risk, percentage       3.00% 4.00%
Float Revenue Earned On Invested Funds | Sales Revenue | Product Concentration Risk          
Disaggregation of Revenue [Line Items]          
Concentration risk, percentage       4.00% 3.00%