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Fair Value Measurements (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value Disclosures [Abstract]        
Fair value of long-term debt $ 284.9 $ 282.0    
Carrying amount of long term debt 272.7 272.3    
Unamortized Debt Issuance Expense   18.1    
Fair value of investments 212.7 155.2 $ 113.6 $ 78.9
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative, Notional Amount 1,900.0 2,280.0    
Foreign currency forward contracts, net notional value 1,390.0 1,260.0    
Deferred compensation plan, contra-equity, shares held in trust 6.0 6.2    
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Foreign currency forward contract, current asset amount 8.7 9.5    
Foreign currency forward contract, current liability amount 22.9 21.2    
Deferred compensation plan assets 173.0 134.3    
Deferred compensation plan liabilities 169.5 129.4    
Foreign Exchange Contract [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset, Fair Value, Gross Asset 8.9 10.0    
Derivative Asset, Fair Value, Gross Liability 0.2 0.5    
Derivative Liability, Fair Value, Gross Asset 1.3 0.9    
Derivative Liability, Fair Value, Gross Liability 24.2 22.1    
Long-Term Senior Notes [Member]        
Fair Value Disclosures [Abstract]        
Unamortized Debt Issuance Expense $ 2.3 $ 2.7