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Schedule I - Condensed Financial Information of the Registrant - Narrative (Details) - USD ($) $ in Millions		1 Months Ended	12 Months Ended
	May 09, 2019	Apr. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Mar. 01, 2021	Jan. 01, 2021	Dec. 01, 2020	Dec. 01, 2019	Oct. 01, 2019	Nov. 08, 2015
NOTES TO CONDENSED FINANCIAL STATEMENTS
Net assets subject to limitations			$ 460.0
Gain on sale					$ 524.6
Proceeds from the sale of noncontrolling interest in a private company			50.9
Gain on sale of noncontrolling interest in private company			47.9
Letters of credit outstanding and bank guarantees			450.0
ROU asset			$ 164.5	$ 189.1
Balance sheet location of ROU asset			Other assets	Other assets
Lease liability			$ 203.0	$ 234.9
Balance sheet location of lease liability			Other liabilities	Other liabilities
Lessee, Operating Lease, Existence of Option to Extend [true false]			true
Private Company
NOTES TO CONDENSED FINANCIAL STATEMENTS
Proceeds from the sale of noncontrolling interest in a private company		$ 50.9
Gain on sale of noncontrolling interest in private company			$ 47.9
Speedpay | Divestitures
NOTES TO CONDENSED FINANCIAL STATEMENTS
Consideration from sale of business	$ 750.0
Speedpay | Divestitures | Other services
NOTES TO CONDENSED FINANCIAL STATEMENTS
Gain on sale	523.0
Minimum
NOTES TO CONDENSED FINANCIAL STATEMENTS
Lease terms			1 year
Maximum
NOTES TO CONDENSED FINANCIAL STATEMENTS
Lease terms			10 years
Lease extension terms			10 years
Reportable Legal Entities | Parent Company
NOTES TO CONDENSED FINANCIAL STATEMENTS
Net assets subject to limitations			$ 460.0
Stated interest rate (as a percent)						0.12%	0.14%	0.15%	1.61%	1.69%
Gain on sale					$ 524.6
Proceeds from the sale of noncontrolling interest in a private company			50.9
Gain on sale of noncontrolling interest in private company			47.9
Letters of credit outstanding and bank guarantees			250.0
ROU asset			$ 56.9	$ 63.1
Balance sheet location of ROU asset			Other assets	Other assets
Lease liability			$ 91.3	$ 100.1
Balance sheet location of lease liability			Other liabilities	Other liabilities
Lessee, Operating Lease, Existence of Option to Extend [true false]			true	true
Reportable Legal Entities | Parent Company | Revolver - Parent Company
NOTES TO CONDENSED FINANCIAL STATEMENTS
Stated interest rate (as a percent)			0.34%	0.26%
Maximum borrowing capacity on unsecured borrowing facilities											$ 3,000.0
Outstanding borrowings on unsecured financing facilities			$ 370.0	$ 620.3
Reportable Legal Entities | Parent Company | Private Company
NOTES TO CONDENSED FINANCIAL STATEMENTS
Proceeds from the sale of noncontrolling interest in a private company		$ 50.9
Gain on sale of noncontrolling interest in private company			$ 47.9
Reportable Legal Entities | Parent Company | Speedpay | Divestitures
NOTES TO CONDENSED FINANCIAL STATEMENTS
Consideration from sale of business	750.0
Reportable Legal Entities | Parent Company | Speedpay | Divestitures | Other services
NOTES TO CONDENSED FINANCIAL STATEMENTS
Gain on sale	$ 523.0
Reportable Legal Entities | Parent Company | Minimum
NOTES TO CONDENSED FINANCIAL STATEMENTS
Lease terms			2 years
Reportable Legal Entities | Parent Company | Maximum
NOTES TO CONDENSED FINANCIAL STATEMENTS
Lease terms			10 years
Lease extension terms			10 years

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