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Fair Value Measurements (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
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 712.6 284.9
Long-term debt, net of debt issuance costs 690.6 272.7
Investments, Fair Value Disclosure, Measured at NAV 195.0 169.0
Foreign currency forward contracts, gross notional value 2,430.0 1,900.0
Foreign currency forward contracts, net notional value 1,820.0 1,390.0
Deferred compensation plan, contra-equity, shares held in trust 5.9 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 14.4 8.9
Derivative Asset, Fair Value, Gross Liability 1.2 0.2
Derivative Liability, Fair Value, Gross Asset 2.3 1.3
Derivative Liability, Fair Value, Gross Liability 4.2 24.2
Long-Term Senior Notes [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unamortized Debt Issuance Expense 4.3 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 13.2 8.7
Foreign currency forward contract, current liability amount 1.9 22.9
Deferred compensation plan assets 229.7 173.0
Deferred compensation plan liabilities $ 228.4 $ 169.5