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Segment Information - Schedule of Reconciliation Of Segment Adjusted Operating Income To Income Before Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Segment Reporting Information [Line Items]    
Segment adjusted operating income $ 268.8 $ 258.7
Stock-based compensation 27.5 12.6
Financing interest expense, net of financial instruments (53.6) (53.0)
Net foreign currency gain (loss) 4.6 (3.1)
Change in fair value of contingent consideration (0.7) (0.8)
Income before income taxes 108.5 100.4
Operating Segments    
Segment Reporting Information [Line Items]    
Segment adjusted operating income 268.8 258.7
Segment Reconciling Items    
Segment Reporting Information [Line Items]    
Unallocated corporate expenses 24.6 24.9
Acquisition-related intangible amortization 45.8 47.8
Other acquisition and divestiture related items 0.0 0.5
Stock-based compensation 29.6 13.3
Other costs 10.4 14.9
Mobility    
Segment Reporting Information [Line Items]    
Segment adjusted operating income 124.5 131.4
Mobility | Operating Segments    
Segment Reporting Information [Line Items]    
Segment adjusted operating income 124.5 131.4
Benefits    
Segment Reporting Information [Line Items]    
Segment adjusted operating income 100.2 86.9
Benefits | Operating Segments    
Segment Reporting Information [Line Items]    
Segment adjusted operating income 100.2 86.9
Corporate Payments    
Segment Reporting Information [Line Items]    
Segment adjusted operating income 44.1 40.5
Corporate Payments | Operating Segments    
Segment Reporting Information [Line Items]    
Segment adjusted operating income $ 44.1 $ 40.5