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Settlement Assets and Obligations - Components of Investment Securities (Details) - USD ($) $ in Millions		Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Cash and cash equivalents
Amortized Cost		$ 1,289.0	$ 1,474.0	$ 1,106.5
Available-for-sale securities:
Fair Value		1,440.5
Settlement Assets
Available-for-sale securities:
Amortized Cost		1,460.2	1,372.9
Fair Value		1,440.5	1,332.3
Gross Unrealized Gains		13.7	6.1
Gross Unrealized Losses		(33.4)	(46.7)
Net Unrealized Gains/ (Losses)		(19.7)	(40.6)
Amortized Cost		1,480.4	1,405.5
Fair Value		1,460.7	1,364.9
Gross Unrealized Gains		13.7	6.1
Gross Unrealized Losses		(33.4)	(46.7)
Net Unrealized Gains/ (Losses)		(19.7)	(40.6)
Money market funds | Settlement Assets
Cash and cash equivalents
Amortized Cost		20.2	32.6
Fair Value		20.2	32.6
State and municipal debt securities | Settlement Assets
Available-for-sale securities:
Amortized Cost	[1]	1,090.7	1,068.1
Fair Value	[1]	1,067.0	1,027.6
Gross Unrealized Gains	[1]	7.1	2.7
Gross Unrealized Losses	[1]	(30.8)	(43.2)
Net Unrealized Gains/ (Losses)	[1]	(23.7)	(40.5)
Asset-backed securities | Settlement Assets
Available-for-sale securities:
Amortized Cost		205.7	208.6
Fair Value		208.6	211.2
Gross Unrealized Gains		2.9	2.6
Net Unrealized Gains/ (Losses)		2.9	2.6
Corporate debt securities | Settlement Assets
Available-for-sale securities:
Amortized Cost		156.0	87.5
Fair Value		157.2	85.0
Gross Unrealized Gains		3.7	0.8
Gross Unrealized Losses		(2.5)	(3.3)
Net Unrealized Gains/ (Losses)		1.2	(2.5)
State and municipal variable-rate demand notes | Settlement Assets
Available-for-sale securities:
Amortized Cost		1.4	1.4
Fair Value		1.4	1.4
United States government agency mortgage-backed securities | Settlement Assets
Available-for-sale securities:
Amortized Cost		6.4	7.3
Fair Value		6.3	7.1
Gross Unrealized Losses		(0.1)	(0.2)
Net Unrealized Gains/ (Losses)		$ (0.1)	$ (0.2)
[1] The majority of these securities are fixed-rate instruments.

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