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Derivatives - Narrative (Details) $ in Millions			3 Months Ended	12 Months Ended
	Dec. 27, 2019 USD ($)	Nov. 25, 2019 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)		Dec. 31, 2020 USD ($) Derivative		Dec. 31, 2019 USD ($)	Mar. 09, 2021 USD ($)	Aug. 22, 2017 USD ($)	Mar. 15, 2017 USD ($)	Mar. 30, 2010
Derivatives
Total borrowings at par value				$ 3,025.0		$ 3,080.0
Accumulated other comprehensive pre-tax gain (loss) to be reclassified into revenue within the next 12 months				16.5
Notes Due 2020
Derivatives
Stated interest rate (as a percent)												5.253%
Repayment of unsecured notes	$ 268.8	$ 56.1
3.600% Notes Due 2022
Derivatives
Total borrowings at par value				$ 500.0		$ 500.0	[1]			$ 100.0	$ 400.0
Stated interest rate (as a percent)				3.60%		3.60%
1.350% Notes Due 2026
Derivatives
Total borrowings at par value			$ 600.0	$ 600.0	[1]				$ 600.0
Stated interest rate (as a percent)			1.35%	1.35%
Business Solutions
Derivatives
Foreign exchange revenues				$ 366.8		$ 311.9		$ 343.1
Cash Flow Hedges | Interest rate contracts | 3.600% Notes Due 2022
Derivatives
Number of derivative instruments held | 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
Cash Flow Hedges | Interest rate contracts | 3.600% Notes Due 2022 | Interest Rate Swap Contract 1
Derivatives
Notional amounts						$ 100.0
Cash Flow Hedges | Interest rate contracts | 3.600% Notes Due 2022 | Interest Rate Swap Contract 2
Derivatives
Notional amounts						150.0
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				$ 8.0		$ 8.0
Minimum | Not designated as hedges | Uncollected Settlement Assets and Obligations
Derivatives
Foreign currency forward contracts maturity range				2 days
Maximum | Uncollected Settlement Assets and Obligations
Derivatives
Foreign currency forward contracts maturity range				1 month
Maximum | Foreign Currency Denominated Cash and Other Asset and Other Liability Positions
Derivatives
Foreign currency forward contracts maturity range				1 year
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] See the Term Loan Facility and Notes sections below for further discussion of the borrowings and repayments of the unsecured notes and term loan made in 2021.

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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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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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The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

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