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Settlement Assets and Obligations - Components of Investment Securities (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Cash and cash equivalents
Amortized Cost	$ 1,295.8	$ 1,208.3	$ 1,502.6
Available-for-sale securities:
Amortized Cost	1,428.1	1,361.1
Fair Value	1,402.3	1,398.9
Gross Unrealized Gains	5.5	40.8
Gross Unrealized Losses	(31.3)	(3.0)
Net Unrealized Gains/ (Losses)	(25.8)	37.8
Amortized Cost	1,434.8	1,369.0
Fair Value	1,409.0	1,406.8
Gross Unrealized Gains	5.5	40.8
Gross Unrealized Losses	31.3	(3.0)
Net Unrealized Gains/ (Losses)	(25.8)	37.8
Money market funds | Settlement Assets
Cash and cash equivalents
Amortized Cost	6.7	7.9
Fair Value	6.7	7.9
State and municipal debt securities
Available-for-sale securities:
Amortized Cost	1,254.8	1,182.6
Fair Value	1,232.0	1,219.9
Gross Unrealized Gains	5.5	39.8
Gross Unrealized Losses	(28.3)	(2.5)
Net Unrealized Gains/ (Losses)	(22.8)	37.3
State and municipal variable rate demand notes
Available-for-sale securities:
Amortized Cost	79.9	84.8
Fair Value	79.9	84.8
Corporate debt securities
Available-for-sale securities:
Amortized Cost	61.9
Fair Value	58.9
Gross Unrealized Losses	(3.0)
Net Unrealized Gains/ (Losses)	(3.0)
Corporate and other debt securities
Available-for-sale securities:
Amortized Cost		58.1
Fair Value		57.8
Gross Unrealized Gains		0.2
Gross Unrealized Losses		(0.5)
Net Unrealized Gains/ (Losses)		(0.3)
United States government agency mortgage-backed securities
Available-for-sale securities:
Amortized Cost	31.5	35.6
Fair Value	$ 31.5	36.4
Gross Unrealized Gains		0.8
Net Unrealized Gains/ (Losses)		$ 0.8

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