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Fair Value Measurements (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value of long-term debt $ 296.0   $ 282.0  
Carrying amount of long term debt 272.6   272.3  
Unamortized Debt Issuance Expense     18.1  
Fair value of investments 204.0 $ 150.3 155.2 $ 113.6
Foreign currency forward contracts, gross notional value 2,050.0   2,280.0  
Foreign currency forward contracts, net notional value 1,080.0   1,260.0  
Derivative, Gain (Loss) on Derivative, Net 0.0 $ 12.5    
Deferred compensation plan, contra-equity, shares held in trust 6.1   6.2  
Foreign Exchange Contract [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset, Fair Value, Gross Asset 6.4   10.0  
Derivative Asset, Fair Value, Gross Liability 0.4   0.5  
Derivative Liability, Fair Value, Gross Asset 0.7   0.9  
Derivative Liability, Fair Value, Gross Liability 6.7   22.1  
Long-Term Senior Notes [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Unamortized Debt Issuance Expense $ 2.4   $ 2.7