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Fair Value Measurements (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
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 $ 0.0    
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount 0.0 0.0    
Fair value of long-term debt 287.1   $ 284.9  
Carrying amount of long term debt 272.8   272.7  
Fair value of investments 214.0 202.3 212.7 $ 155.2
Foreign currency forward contracts, gross notional value 1,880.0   1,900.0  
Foreign currency forward contracts, net notional value 1,330.0   1,390.0  
Foreign Currency Transaction Gain (Loss), Unrealized 15.6 $ 14.6    
Deferred compensation plan, contra-equity, shares held in trust 6.2   6.0  
Foreign Exchange Contract [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset, Fair Value, Gross Asset 17.9   8.9  
Derivative Asset, Fair Value, Gross Liability 2.0   0.2  
Derivative Liability, Fair Value, Gross Asset 0.2   1.3  
Derivative Liability, Fair Value, Gross Liability 0.5   24.2  
Long-Term Senior Notes [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Unamortized Debt Issuance Expense 2.2   2.3  
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 15.9   8.7  
Foreign currency forward contract, current liability amount 0.3   22.9  
Deferred compensation plan assets 198.5   173.0  
Deferred compensation plan liabilities 192.9   169.5  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Foreign currency forward contract, current asset amount 0.0   0.0  
Foreign currency forward contract, current liability amount 0.0   0.0  
Deferred compensation plan assets 0.0   0.0  
Deferred compensation plan liabilities $ 0.0   $ 0.0