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Derivative Financial Instruments (Fair Value of Derivative Instruments) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Derivatives, Fair Value [Line Items]    
Derivative Assets $ 10.1 $ 16.6
Derivative Liabilities 9.2 14.5
Foreign exchange contracts | Derivatives designated as hedging instruments | Other current assets    
Derivatives, Fair Value [Line Items]    
Derivative Assets 1.8 3.3
Foreign exchange contracts | Derivatives designated as hedging instruments | Other current liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 0.1 0.1
Foreign exchange contracts | Derivatives not designated as hedging instruments | Other current assets    
Derivatives, Fair Value [Line Items]    
Derivative Assets 0.4 0.6
Foreign exchange contracts | Derivatives not designated as hedging instruments | Other current liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 1.2 1.7
Foreign exchange contracts | Derivatives not designated as hedging instruments | Other Noncurrent Assets    
Derivatives, Fair Value [Line Items]    
Derivative Assets 7.9 12.7
Foreign exchange contracts | Derivatives not designated as hedging instruments | Other Noncurrent Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities $ 7.9 $ 12.7