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Settlement Assets and Obligations - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2019	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables from agents, business solutions customers, and others, net	$ 1,175.1		$ 1,135.1
Provision for doubtful accounts		$ 47.1
Advances to agents	$ 146.9		135.9
Variable rate demand notes, maximum maturity year	2050
Due after 10 years	$ 157.3
Receivables from agents and others
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables from agents, business solutions customers, and others, net	1,125.9		1,081.2
Receivables from Business Solutions customers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables from agents, business solutions customers, and others, net	49.2		$ 53.9
State and municipal variable rate demand notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Due after 10 years	$ 84.8

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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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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
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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
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

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Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Maximum maturity year for variable rate demand notes.

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