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Settlement Assets and Obligations - Components of Investment Securities (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022		Jun. 30, 2022
Cash and cash equivalents
Amortized Cost	$ 1,585.9	$ 1,285.9		$ 1,201.9
Available-for-sale securities:
Fair Value	1,420.0
Settlement Assets
Available-for-sale securities:
Amortized Cost	1,493.7	1,417.8
Fair Value	1,420.0	1,333.7
Gross Unrealized Gains	2.5	1.4
Gross Unrealized Losses	(76.2)	(85.5)
Net Unrealized Gains/ (Losses)	(73.7)	(84.1)
Amortized Cost	1,501.3	1,429.5
Fair Value	1,427.6	1,345.4
Gross Unrealized Gains	2.5	1.4
Gross Unrealized Losses	76.2	85.5
Net Unrealized Gains/ (Losses)	(73.7)	(84.1)
Money market funds | Settlement Assets
Cash and cash equivalents
Amortized Cost	7.6	11.7
Fair Value	7.6	11.7
State and municipal debt securities | Settlement Assets
Available-for-sale securities:
Amortized Cost	1,085.6	1,010.5	[1]
Fair Value	1,019.3	933.3	[1]
Gross Unrealized Gains	1.8	0.3	[1]
Gross Unrealized Losses	(68.1)	(77.5)	[1]
Net Unrealized Gains/ (Losses)	(66.3)	(77.2)	[1]
Asset-backed securities | Settlement Assets
Available-for-sale securities:
Amortized Cost	191.3	183.4
Fair Value	190.9	184.1
Gross Unrealized Gains	0.4	0.8
Gross Unrealized Losses	(0.8)	(0.1)
Net Unrealized Gains/ (Losses)	(0.4)	0.7
Corporate debt securities | Settlement Assets
Available-for-sale securities:
Amortized Cost	153.7	153.5
Fair Value	147.5	146.9
Gross Unrealized Gains	0.3	0.3
Gross Unrealized Losses	(6.5)	(6.9)
Net Unrealized Gains/ (Losses)	(6.2)	(6.6)
State and municipal variable-rate demand notes | Settlement Assets
Available-for-sale securities:
Amortized Cost	46.3	48.9
Fair Value	46.3	48.9
United States government agency mortgage-backed securities | Settlement Assets
Available-for-sale securities:
Amortized Cost	16.8	21.5
Fair Value	16.0	20.5
Gross Unrealized Losses	(0.8)	(1.0)
Net Unrealized Gains/ (Losses)	$ (0.8)	$ (1.0)
[1] The majority of these securities are fixed-rate instruments.

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