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Settlement Assets and Obligations - Components of Investment Securities (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash and cash equivalents
Amortized Cost		$ 1,268.6	$ 1,285.9	$ 1,208.3
Available-for-sale securities:
Fair Value		1,458.2
Settlement Assets
Available-for-sale securities:
Amortized Cost		1,498.4	1,417.8
Fair Value		1,458.2	1,333.7
Gross Unrealized Gains		11.4	1.4
Gross Unrealized Losses		(51.6)	(85.5)
Net Unrealized Gains/ (Losses)		(40.2)	(84.1)
Amortized Cost		1,510.2	1,429.5
Fair Value		1,470.0	1,345.4
Gross Unrealized Gains		11.4	1.4
Gross Unrealized Losses		(51.6)	(85.5)
Net Unrealized Gains/ (Losses)		(40.2)	(84.1)
Money market funds | Settlement Assets
Cash and cash equivalents
Amortized Cost		11.8	11.7
Fair Value		11.8	11.7
State and municipal debt securities | Settlement Assets
Available-for-sale securities:
Amortized Cost	[1]	1,049.3	1,010.5
Fair Value	[1]	1,011.4	933.3
Gross Unrealized Gains	[1]	8.7	0.3
Gross Unrealized Losses	[1]	(46.6)	(77.5)
Net Unrealized Gains/ (Losses)	[1]	(37.9)	(77.2)
Asset-backed securities | Settlement Assets
Available-for-sale securities:
Amortized Cost		194.5	183.4
Fair Value		195.7	184.1
Gross Unrealized Gains		1.2	0.8
Gross Unrealized Losses			(0.1)
Net Unrealized Gains/ (Losses)		1.2	0.7
Corporate debt securities | Settlement Assets
Available-for-sale securities:
Amortized Cost		155.2	153.5
Fair Value		152.2	146.9
Gross Unrealized Gains		1.5	0.3
Gross Unrealized Losses		(4.5)	(6.9)
Net Unrealized Gains/ (Losses)		(3.0)	(6.6)
State and municipal variable rate demand notes | Settlement Assets
Available-for-sale securities:
Amortized Cost		86.8	48.9
Fair Value		86.8	48.9
United States government agency mortgage-backed securities | Settlement Assets
Available-for-sale securities:
Amortized Cost		12.6	21.5
Fair Value		12.1	20.5
Gross Unrealized Losses		(0.5)	(1.0)
Net Unrealized Gains/ (Losses)		$ (0.5)	$ (1.0)
[1] The majority of these securities are fixed-rate instruments.

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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