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Settlement Assets and Obligations - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables from agents, business solutions customers, and others, net	$ 1,117.5	$ 1,175.1
Advances to agents	$ 143.9	146.9
Variable rate demand notes, maximum maturity year	2050
Due after 5 years through 10 years	$ 554.8
Due after 10 years	153.0
Receivables from agents and others
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables from agents, business solutions customers, and others, net	1,089.9	1,125.9
Receivables from Business Solutions customers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables from agents, business solutions customers, and others, net	27.6	$ 49.2
State and municipal variable rate demand notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Due after 5 years through 10 years	10.0
Due after 10 years	$ 69.9

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Amount, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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Amount excluding accrued interest, after allowance for credit loss, of financing receivable.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
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Maximum maturity year for variable rate demand notes.

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