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Fair Value Measurements (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Document Period End Date	Jun. 30, 2020
Derivative, Notional Amount	$ 2,000.0	$ 2,300.0
Fair value of long-term debt	645.4	685.9
Long-term debt, net of debt issuance costs	665.4	664.6
Investments, Fair Value Disclosure	304.1	328.6	$ 272.8	$ 247.3
Foreign currency forward contracts, net notional value	980.0	1,050.0
Deferred compensation plan, contra-equity, shares held in trust	5.7	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	3.6	10.6
Derivative Asset, Fair Value, Gross Liability	0.7	0.1
Derivative Liability, Fair Value, Gross Asset	0.6	0.8
Derivative Liability, Fair Value, Gross Liability	5.5	5.2
Long-Term Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unamortized Debt Issuance Expense	2.8	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	187.8	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	3.0	10.5
Foreign currency forward contract, current liability amount	5.0	4.4
Deferred compensation plan assets	372.4	349.9
Deferred compensation plan liabilities	$ 351.1	$ 346.1

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