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Settlement Assets and Obligations - Components of Investment Securities (Details) - USD ($) $ in Millions		Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Cash and cash equivalents
Amortized Cost		$ 1,106.5	$ 1,268.6	$ 1,228.6
Available-for-sale securities:
Fair Value		1,403.0
Settlement Assets
Available-for-sale securities:
Amortized Cost		1,448.7	1,498.4
Fair Value		1,403.0	1,458.2
Gross Unrealized Gains		6.8	11.4
Gross Unrealized Losses		(52.5)	(51.6)
Net Unrealized Gains/ (Losses)		(45.7)	(40.2)
Amortized Cost		1,461.7	1,510.2
Fair Value		1,416.0	1,470.0
Gross Unrealized Gains		6.8	11.4
Gross Unrealized Losses		(52.5)	(51.6)
Net Unrealized Gains/ (Losses)		(45.7)	(40.2)
Money market funds | Settlement Assets
Cash and cash equivalents
Amortized Cost		13.0	11.8
Fair Value		13.0	11.8
State and municipal debt securities | Settlement Assets
Available-for-sale securities:
Amortized Cost	[1]	1,087.1	1,049.3
Fair Value	[1]	1,044.8	1,011.4
Gross Unrealized Gains	[1]	5.2	8.7
Gross Unrealized Losses	[1]	(47.5)	(46.6)
Net Unrealized Gains/ (Losses)	[1]	(42.3)	(37.9)
Asset-backed securities | Settlement Assets
Available-for-sale securities:
Amortized Cost		212.9	194.5
Fair Value		213.8	195.7
Gross Unrealized Gains		1.0	1.2
Gross Unrealized Losses		(0.1)
Net Unrealized Gains/ (Losses)		0.9	1.2
Corporate debt securities | Settlement Assets
Available-for-sale securities:
Amortized Cost		89.9	155.2
Fair Value		86.2	152.2
Gross Unrealized Gains		0.6	1.5
Gross Unrealized Losses		(4.3)	(4.5)
Net Unrealized Gains/ (Losses)		(3.7)	(3.0)
State and municipal variable-rate demand notes | Settlement Assets
Available-for-sale securities:
Amortized Cost		47.7	86.8
Fair Value		47.7	86.8
United States government agency mortgage-backed securities | Settlement Assets
Available-for-sale securities:
Amortized Cost		11.1	12.6
Fair Value		10.5	12.1
Gross Unrealized Losses		(0.6)	(0.5)
Net Unrealized Gains/ (Losses)		$ (0.6)	$ (0.5)
[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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