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Fair Value Measurements (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Document Period End Date	Mar. 31, 2020
Derivative, Notional Amount	$ 1,800.0	$ 2,300.0
Fair value of long-term debt	595.5	685.9
Long-term debt, net of debt issuance costs	656.1	664.6
Investments, Fair Value Disclosure	302.0	328.6	$ 259.6	$ 247.3
Foreign currency forward contracts, net notional value	840.0	1,050.0
Deferred compensation plan, contra-equity, shares held in trust	5.6	5.7
Foreign Exchange Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	7.3	10.6
Derivative Asset, Fair Value, Gross Liability	1.2	0.1
Derivative Liability, Fair Value, Gross Asset	2.1	0.8
Derivative Liability, Fair Value, Gross Liability	8.3	5.2
Long-Term Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unamortized Debt Issuance Expense	2.9	3.1
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	197.4	224.8
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	6.1	10.5
Foreign currency forward contract, current liability amount	6.2	4.4
Deferred compensation plan assets	374.2	349.9
Deferred compensation plan liabilities	$ 348.4	$ 346.1

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The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.

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