v3.26.3
Segment Information - Schedule of Revenue by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Segment Reporting [Line Items]        
Total revenues (revenues from external customers) $ 780.1 $ 691.8 $ 2,207.5 $ 1,987.9
Less        
Service fees 22.1 22.6 70.1 71.5
Provision for credit losses 23.2 20.4 85.5 57.9
Operating interest expense 33.2 29.2 89.5 82.0
Segment adjusted operating income 360.0 297.2   824.4
Payment processing revenue        
Segment Reporting [Line Items]        
Total revenues (revenues from external customers) 344.8 301.7 973.4 858.8
Account servicing revenue        
Segment Reporting [Line Items]        
Total revenues (revenues from external customers) 186.7 185.3 547.0 542.3
Finance fee revenue        
Segment Reporting [Line Items]        
Total revenues (revenues from external customers) 115.9 83.2 297.9 239.3
Other revenue        
Segment Reporting [Line Items]        
Total revenues (revenues from external customers) 132.7 121.5 389.1 347.6
Mobility        
Segment Reporting [Line Items]        
Total revenues (revenues from external customers) 435.1 360.8 1,202.1 1,040.8
Less        
Processing costs, adjusted 73.6 73.7 216.0 217.3
Service fees 2.0 1.7 5.6 5.8
Provision for credit losses 21.1 15.1 77.2 44.4
Operating interest expense 25.1 22.2 69.0 63.1
Sales and marketing expense, adjusted 66.5 59.5 197.5 176.1
General and administrative expense, adjusted 25.3 25.6 76.1 75.4
Other segment items 17.6 16.3 49.6 46.5
Segment adjusted operating income 203.9 146.7 511.1 412.2
Mobility | Payment processing revenue        
Segment Reporting [Line Items]        
Total revenues (revenues from external customers) 205.4 168.2 573.0 484.9
Mobility | Account servicing revenue        
Segment Reporting [Line Items]        
Total revenues (revenues from external customers) 57.1 53.7 164.2 155.6
Mobility | Finance fee revenue        
Segment Reporting [Line Items]        
Total revenues (revenues from external customers) 115.7 82.9 297.1 238.1
Mobility | Other revenue        
Segment Reporting [Line Items]        
Total revenues (revenues from external customers) 56.9 56.0 167.9 162.2
Benefits        
Segment Reporting [Line Items]        
Total revenues (revenues from external customers) 207.6 198.1 629.8 592.5
Less        
Processing costs, adjusted 67.9 63.4 197.6 189.1
Service fees 19.7 17.8 60.0 57.5
Provision for credit losses 0.2 0.5 0.4 (0.8)
Operating interest expense 1.5 1.3 4.3 3.8
Sales and marketing expense, adjusted 13.9 13.5 44.3 40.7
General and administrative expense, adjusted 5.4 5.5 19.3 16.1
Other segment items 11.5 9.4 32.7 27.6
Segment adjusted operating income 87.5 86.7 271.2 258.5
Benefits | Payment processing revenue        
Segment Reporting [Line Items]        
Total revenues (revenues from external customers) 25.8 23.8 88.3 80.8
Benefits | Account servicing revenue        
Segment Reporting [Line Items]        
Total revenues (revenues from external customers) 110.2 113.3 332.1 339.7
Benefits | Finance fee revenue        
Segment Reporting [Line Items]        
Total revenues (revenues from external customers) 0.1 0.0 0.2 0.1
Benefits | Other revenue        
Segment Reporting [Line Items]        
Total revenues (revenues from external customers) 71.5 61.0 209.2 172.0
Corporate Payments        
Segment Reporting [Line Items]        
Total revenues (revenues from external customers) 137.4 132.8 375.6 354.5
Less        
Processing costs, adjusted 18.0 17.5 52.6 53.2
Service fees 0.5 3.0 4.5 8.2
Provision for credit losses 1.9 4.8 6.1 14.2
Operating interest expense 6.6 5.7 16.2 15.1
Sales and marketing expense, adjusted 21.1 18.7 64.3 52.9
General and administrative expense, adjusted 11.2 10.1 33.3 30.3
Other segment items 9.5 9.1 27.5 26.9
Segment adjusted operating income 68.5 63.8 171.1 153.7
Corporate Payments | Payment processing revenue        
Segment Reporting [Line Items]        
Total revenues (revenues from external customers) 113.6 109.7 312.1 293.1
Corporate Payments | Account servicing revenue        
Segment Reporting [Line Items]        
Total revenues (revenues from external customers) 19.4 18.3 50.8 47.0
Corporate Payments | Finance fee revenue        
Segment Reporting [Line Items]        
Total revenues (revenues from external customers) 0.1 0.3 0.7 1.0
Corporate Payments | Other revenue        
Segment Reporting [Line Items]        
Total revenues (revenues from external customers) $ 4.3 $ 4.5 $ 12.0 $ 13.4