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Fair Value Measurements (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount $ 0.0   $ 0.0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount 0.0   $ 0.0
Fair value of long-term debt 690.9 $ 712.6  
Long-term debt, net of debt issuance costs 679.7 690.6  
Investments, Fair Value Disclosure, Measured at NAV 192.9 195.0  
Foreign currency forward contracts, gross notional value 2,030.0 2,430.0  
Foreign currency forward contracts, net notional value 910.0 1,820.0  
Deferred compensation plan, contra-equity, shares held in trust 6.0 5.9  
Foreign Exchange Contract [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset, Fair Value, Gross Asset 8.1 14.4  
Derivative Asset, Fair Value, Gross Liability 0.2 1.2  
Derivative Liability, Fair Value, Gross Asset 1.3 2.3  
Derivative Liability, Fair Value, Gross Liability 3.3 4.2  
Long-Term Senior Notes [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Unamortized Debt Issuance Expense 4.0 4.3  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Foreign currency forward contract, current asset amount 7.9 13.2  
Foreign currency forward contract, current liability amount 2.0 1.9  
Deferred compensation plan assets 257.2 229.7  
Deferred compensation plan liabilities $ 254.6 $ 228.4