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Derivatives - Narrative (Details) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2022 USD ($)		Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($) Derivative	Jun. 30, 2022 USD ($)		Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Derivatives
Total borrowings at par value	$ 2,710.0				$ 2,710.0			$ 3,025.0
Accumulated other comprehensive pre-tax gain (loss) to be reclassified into revenue within the next 12 months	40.7				40.7
3.600% Notes Due 2022
Derivatives
Total borrowings at par value			$ 500.0				$ 500.0
Stated interest rate (as a percent)			3.60%				3.60%
1.350% Notes Due 2026
Derivatives
Total borrowings at par value	$ 600.0	[1]		$ 600.0	$ 600.0	[1]		$ 600.0	[1]
Stated interest rate (as a percent)	1.35%			1.35%	1.35%			1.35%
Business Solutions
Derivatives
Foreign exchange revenues	$ 33.6		$ 87.4		$ 112.2		$ 171.9
Cash Flow Hedges | Interest rate contracts | 3.600% Notes Due 2022
Derivatives
Number of derivative instruments terminated | Derivative				2
Deferred gain on termination of treasury locks				$ 2.6
Cash payment received for terminated swap agreement				3.3
Gain on derivative recognized in Other income/(expense), net				$ 0.7
Designated as hedges | Foreign currency contracts
Derivatives
Derivative policy - contract maturity period maximum					36 months
Derivative policy - targeted weighted-average maturity					1 year
Maximum remaining maturity of foreign currency derivatives					24 months
Derivative weighted-average maturity					1 year
Not designated as hedges | Foreign currency contracts | Business Solutions
Derivatives
Notional amounts	$ 5,000.0				$ 5,000.0			$ 8,000.0
Minimum | Not designated as hedges | Uncollected Settlement Assets and Obligations
Derivatives
Foreign currency forward contracts maturity range					2 days
Maximum | Not designated as hedges | Uncollected Settlement Assets and Obligations
Derivatives
Foreign currency forward contracts maturity range					1 month
Maximum | Not designated as hedges | Foreign currency contracts | Business Solutions
Derivatives
Foreign currency forward contracts maturity range					1 year
Maximum | Not designated as hedges | Foreign Currency Denominated Cash and Other Asset and Other Liability Positions
Derivatives
Foreign currency forward contracts maturity range					1 year
[1] The difference between the stated interest rate and the effective interest rate is not significant.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The amount of cash received during the period on settlement of a hedge.

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Nominal or face amount used to calculate payment on derivative.

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Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Aggregate gain on all derivative instruments recognized in earnings during the period, before tax effects.

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Maximum amount of time remaining before foreign currency exchange rate derivatives mature or expire, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount as of the balance sheet date of the unamortized adjustment to the carrying value of a cash flow hedged item made under an effective cash flow hedge that is amortized upon discontinuation of the cash flow hedge.

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Derivative contract maturity period, maximum, per the Company's policy.

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