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Settlement Assets and Obligations - Components of Investment Securities (Details) - USD ($) $ in Millions		Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Cash and cash equivalents
Amortized Cost		$ 1,228.6	$ 1,285.9	$ 1,295.8
Available-for-sale securities:
Amortized Cost		1,497.2	1,417.8
Fair Value		1,437.3	1,333.7
Gross Unrealized Gains		6.2	1.4
Gross Unrealized Losses		(66.1)	(85.5)
Net Unrealized Gains/ (Losses)		(59.9)	(84.1)
Amortized Cost		1,673.0	1,429.5
Fair Value		1,613.1	1,345.4
Gross Unrealized Gains		6.2	1.4
Gross Unrealized Losses		(66.1)	(85.5)
Net Unrealized Gains/ (Losses)		(59.9)	(84.1)
Money market funds
Cash and cash equivalents
Amortized Cost		150.0
Fair Value		150.0
Money market funds | Settlement Assets
Cash and cash equivalents
Amortized Cost		25.8	11.7
Fair Value		25.8	11.7
State and municipal debt securities
Available-for-sale securities:
Amortized Cost	[1]	1,066.7	1,010.5
Fair Value	[1]	1,010.3	933.3
Gross Unrealized Gains	[1]	3.0	0.3
Gross Unrealized Losses	[1]	(59.4)	(77.5)
Net Unrealized Gains/ (Losses)	[1]	(56.4)	(77.2)
Asset-backed securities
Available-for-sale securities:
Amortized Cost		193.9	183.4
Fair Value		196.4	184.1
Gross Unrealized Gains		2.6	0.8
Gross Unrealized Losses		(0.1)	(0.1)
Net Unrealized Gains/ (Losses)		2.5	0.7
Corporate debt securities
Available-for-sale securities:
Amortized Cost		153.0	153.5
Fair Value		147.7	146.9
Gross Unrealized Gains		0.6	0.3
Gross Unrealized Losses		(5.9)	(6.9)
Net Unrealized Gains/ (Losses)		(5.3)	(6.6)
State and municipal variable-rate demand notes
Available-for-sale securities:
Amortized Cost		64.1	48.9
Fair Value		64.1	48.9
United States government agency mortgage-backed securities
Available-for-sale securities:
Amortized Cost		19.5	21.5
Fair Value		18.8	20.5
Gross Unrealized Losses		(0.7)	(1.0)
Net Unrealized Gains/ (Losses)		$ (0.7)	$ (1.0)
[1] The majority of these securities are fixed-rate instruments.

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