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Fair Value Measurements (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Notional Amount	$ 2,410.0	$ 2,610.0
Fair value of long-term debt	667.9	687.2
Long-term debt, net of debt issuance costs	387.8	395.6
Investments, Fair Value Disclosure	677.5	639.6	$ 435.4	$ 340.3
Foreign currency forward contracts, net notional value	1,280.0	1,510.0
Deferred compensation plan, contra-equity, shares held in trust	5.1	5.2
Foreign Exchange Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	22.0	19.2
Derivative Asset, Fair Value, Gross Liability	2.8	3.3
Derivative Liability, Fair Value, Gross Asset	2.4	0.2
Derivative Liability, Fair Value, Gross Liability	6.4	1.0
Long-Term Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unamortized Debt Issuance Expense	1.4	1.4
Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	387.4	372.8
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0	0.0
Foreign currency forward contract, current asset amount	19.3	15.9
Foreign currency forward contract, current liability amount	4.0	0.8
Deferred compensation plan assets	558.3	528.8
Deferred compensation plan liabilities	$ 493.8	$ 513.0

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