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Fair Value Measurements (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Document Period End Date	Sep. 30, 2020
Derivative, Notional Amount	$ 2,030.0	$ 2,300.0
Fair value of long-term debt	686.1	685.9
Long-term debt, net of debt issuance costs	682.9	664.6
Investments, Fair Value Disclosure	299.0	328.6	$ 304.2	$ 247.3
Foreign currency forward contracts, net notional value	1,050.0	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	3.4	10.6
Derivative Asset, Fair Value, Gross Liability	0.2	0.1
Derivative Liability, Fair Value, Gross Asset	1.9	0.8
Derivative Liability, Fair Value, Gross Liability	12.4	5.2
Long-Term Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unamortized Debt Issuance Expense	2.7	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	192.4	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	3.2	10.5
Foreign currency forward contract, current liability amount	10.5	4.4
Deferred compensation plan assets	410.7	349.9
Deferred compensation plan liabilities	$ 388.4	$ 346.1

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