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Revenue - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) Item	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Revenue
Revenues from contracts with customers	$ 4,865.5	$ 4,625.1	$ 5,033.2
Consumer money transfers
Revenue
Revenues from contracts with customers	$ 4,320.9	4,133.0	4,304.3
Number of performance obligations | Item	1
Number of integrated services involved in a transaction | Item	1
Consumer bill payments
Revenue
Revenues from contracts with customers	$ 156.6	$ 156.3	$ 357.5

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