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Segment Information - Schedule of Other Segment Reportable Income and Expense Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Operating interest expense	$ 23.7	$ 24.1
Mobility
Segment Reporting Information [Line Items]
Interest income	5.0	3.1
Operating interest expense	18.7	18.7
Depreciation	15.5	14.9
Benefits
Segment Reporting Information [Line Items]
Interest income	55.9	44.6
Operating interest expense	1.4	1.2
Depreciation	10.4	9.0
Corporate Payments
Segment Reporting Information [Line Items]
Interest income	2.7	3.1
Operating interest expense	3.6	4.2
Depreciation	$ 8.9	$ 8.8

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