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Fair Value Measurements (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Document Period End Date	Mar. 31, 2021
Derivative, Notional Amount	$ 2,220.0	$ 2,340.0
Fair value of long-term debt	704.8	723.7
Long-term debt, net of debt issuance costs	684.0	702.0
Investments, Fair Value Disclosure	435.4	340.3	$ 302.0	$ 328.6
Foreign currency forward contracts, net notional value	1,220.0	1,420.0
Deferred compensation plan, contra-equity, shares held in trust	5.4	5.6
Foreign Exchange Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	8.4	13.5
Derivative Asset, Fair Value, Gross Liability	1.5	0.4
Derivative Liability, Fair Value, Gross Asset	0.7	2.7
Derivative Liability, Fair Value, Gross Liability	10.1	6.1
Long-Term Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unamortized Debt Issuance Expense	2.3	2.5
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	222.7	203.8
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	6.9	13.1
Foreign currency forward contract, current liability amount	9.4	3.4
Deferred compensation plan assets	480.2	446.3
Deferred compensation plan liabilities	$ 452.0	$ 427.6

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