Revenues - Summary of Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	$ 444.5	$ 441.3	$ 888.5	$ 811.0
Non-Topic 606 revenues	176.7	156.9	344.8	304.8
Total revenues	621.3	598.2	1,233.3	1,115.8
Mobility
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	197.9	229.2	397.1	405.3
Non-Topic 606 revenues	142.2	150.1	285.4	293.0
Total revenues	340.2	379.2	682.5	698.4
Corporate Payments
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	115.3	99.1	216.0	175.2
Non-Topic 606 revenues	6.6	1.3	10.7	2.4
Total revenues	121.9	100.4	226.7	177.7
Benefits
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	131.3	113.1	275.4	230.4
Non-Topic 606 revenues	27.9	5.5	48.7	9.4
Total revenues	159.2	118.6	324.1	239.7
Payment processing revenue
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	300.5	312.3	588.6	551.8
Total revenues	300.5	312.3	588.6	551.8
Payment processing revenue | Mobility
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	172.2	202.4	343.7	354.3
Total revenues	172.2	202.4	343.7	354.3
Payment processing revenue | Corporate Payments
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	104.7	88.6	194.8	153.7
Total revenues	104.7	88.6	194.8	153.7
Payment processing revenue | Benefits
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	23.6	21.3	50.1	43.8
Total revenues	23.6	21.3	50.1	43.8
Account servicing revenue
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	116.6	98.3	241.4	200.2
Total revenues	152.9	137.6	313.6	277.6
Account servicing revenue | Mobility
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	4.5	4.6	8.9	8.9
Total revenues	40.8	43.9	81.1	86.3
Account servicing revenue | Corporate Payments
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	10.6	10.4	21.2	21.2
Total revenues	10.6	10.4	21.2	21.2
Account servicing revenue | Benefits
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	101.5	83.4	211.3	170.1
Total revenues	101.5	83.4	211.3	170.1
Other revenue
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	27.4	30.7	58.5	59.0
Total revenues	91.5	63.0	174.0	122.5
Other revenue | Mobility
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	21.2	22.2	44.5	42.2
Total revenues	50.9	47.9	101.0	94.3
Other revenue | Corporate Payments
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	0.0	0.1	0.0	0.4
Total revenues	6.5	1.2	10.4	2.5
Other revenue | Benefits
Disaggregation of Revenue [Line Items]
Total Topic 606 revenues	6.2	8.4	14.0	16.4
Total revenues	$ 34.1	$ 13.9	$ 62.6	$ 25.7