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Fair Value Measurements (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
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    
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount $ 0.0 0.0    
Fair value of long-term debt 671.4 712.6    
Long-term debt, net of debt issuance costs 671.5 690.6    
Foreign currency forward contracts, gross notional value 1,990.0 2,430.0    
Foreign currency forward contracts, net notional value 840.0 1,820.0    
Deferred compensation plan, contra-equity, shares held in trust 5.8 5.9    
Investments, Fair Value Disclosure 247.3 242.3 $ 212.7 $ 155.2
Foreign Exchange Contract [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset, Fair Value, Gross Asset 6.7 14.4    
Derivative Asset, Fair Value, Gross Liability 0.2 1.2    
Derivative Liability, Fair Value, Gross Asset 0.6 2.3    
Derivative Liability, Fair Value, Gross Liability 9.2 4.2    
Long-Term Senior Notes [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Unamortized Debt Issuance Expense 3.7 4.3    
Fair Value, Measurements, 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 191.2 195.0    
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 6.5 13.2    
Foreign currency forward contract, current liability amount 8.6 1.9    
Deferred compensation plan assets 258.2 229.7    
Deferred compensation plan liabilities 251.8 228.4    
Investments, Fair Value Disclosure $ 0.0 $ 0.0