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Settlement Assets and Obligations - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables from agents and others, net	$ 1,820.3	$ 1,732.9
Variable rate demand notes, maximum maturity year	2052
Due after 10 years	$ 289.7
Other Assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Advances to agents	200.7	188.5
Receivables from agents and others
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables from agents and others, net	1,820.3	$ 1,732.9
State and municipal variable-rate demand notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Due after 10 years	$ 47.7

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 946
-SubTopic 310
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
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-Publisher FASB
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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing after rolling tenth fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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