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Settlement Assets and Obligations - Components of Investment Securities (Details) - USD ($) $ in Millions		Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Cash and cash equivalents
Amortized Cost		$ 1,138.2	$ 1,285.9	$ 1,176.1
Available-for-sale securities:
Fair Value		1,383.3
Settlement Assets
Available-for-sale securities:
Amortized Cost		1,473.6	1,417.8
Fair Value		1,383.3	1,333.7
Gross Unrealized Gains		0.4	1.4
Gross Unrealized Losses		(90.7)	(85.5)
Net Unrealized Gains/ (Losses)		(90.3)	(84.1)
Amortized Cost		1,480.0	1,429.5
Fair Value		1,389.7	1,345.4
Gross Unrealized Gains		0.4	1.4
Gross Unrealized Losses		(90.7)	(85.5)
Net Unrealized Gains/ (Losses)		(90.3)	(84.1)
Money market funds | Settlement Assets
Cash and cash equivalents
Amortized Cost		6.4	11.7
Fair Value		6.4	11.7
State and municipal debt securities | Settlement Assets
Available-for-sale securities:
Amortized Cost	[1]	1,062.3	1,010.5
Fair Value	[1]	981.0	933.3
Gross Unrealized Gains	[1]	0.2	0.3
Gross Unrealized Losses	[1]	(81.5)	(77.5)
Net Unrealized Gains/ (Losses)	[1]	(81.3)	(77.2)
Asset-backed securities | Settlement Assets
Available-for-sale securities:
Amortized Cost		188.5	183.4
Fair Value		187.5	184.1
Gross Unrealized Gains		0.1	0.8
Gross Unrealized Losses		(1.1)	(0.1)
Net Unrealized Gains/ (Losses)		(1.0)	0.7
Corporate debt securities | Settlement Assets
Available-for-sale securities:
Amortized Cost		159.9	153.5
Fair Value		152.9	146.9
Gross Unrealized Gains		0.1	0.3
Gross Unrealized Losses		(7.1)	(6.9)
Net Unrealized Gains/ (Losses)		(7.0)	(6.6)
State and municipal variable-rate demand notes | Settlement Assets
Available-for-sale securities:
Amortized Cost		48.3	48.9
Fair Value		48.3	48.9
United States government agency mortgage-backed securities | Settlement Assets
Available-for-sale securities:
Amortized Cost		14.6	21.5
Fair Value		13.6	20.5
Gross Unrealized Losses		(1.0)	(1.0)
Net Unrealized Gains/ (Losses)		$ (1.0)	$ (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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