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Fair Value Measurements (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value of long-term debt $ 667.0 $ 671.4    
Long-term debt, net of debt issuance costs 653.3 671.5    
Investments, Fair Value Disclosure 304.2 247.3 $ 246.0 $ 242.3
Foreign currency forward contracts, gross notional value 2,060.0 1,990.0    
Foreign currency forward contracts, net notional value 640.0 840.0    
Deferred compensation plan, contra-equity, shares held in trust 5.7 5.8    
Foreign Exchange Contract [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset, Fair Value, Gross Asset 8.0 6.7    
Derivative Asset, Fair Value, Gross Liability 0.6 0.2    
Derivative Liability, Fair Value, Gross Asset 1.2 0.6    
Derivative Liability, Fair Value, Gross Liability 10.9 9.2    
Long-Term Senior Notes [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Unamortized Debt Issuance Expense 3.3 3.7    
Fair Value, 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 221.6 191.2    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments, Fair Value Disclosure 0.0 0.0    
Foreign currency forward contract, current asset amount 7.4 6.5    
Foreign currency forward contract, current liability amount 9.7 8.6    
Deferred compensation plan assets 326.5 258.2    
Deferred compensation plan liabilities $ 315.9 $ 251.8