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Settlement Assets and Obligations - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables from agents, business solutions customers, and others, net	$ 1,265.3	$ 1,265.3	$ 1,175.1
Advances to agents	1,277.2	$ 1,277.2	1,198.8
Variable rate demand notes, maximum maturity year		2061
Due after 1 year through 5 years	539.4	$ 539.4
Due after 5 years through 10 years	394.8	394.8
Due after 10 years	186.4	186.4
Other Assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Advances to agents	147.1	147.1	146.9
Receivables from agents and others
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables from agents, business solutions customers, and others, net	1,243.3	1,243.3	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	22.0	22.0	$ 49.2
State and municipal variable rate demand notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Due after 1 year through 5 years	10.0	10.0
Due after 5 years through 10 years	10.0	10.0
Due after 10 years	77.5	77.5
State and municipal debt securities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impairment of securities recorded as revenues	$ 4.6	$ 4.6

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