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Derivative Financial Instruments (Fair Value of Derivative Instruments) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Derivatives, Fair Value [Line Items]    
Derivative Assets $ 12.0 $ 16.6
Derivative Liabilities 12.6 14.5
Foreign exchange contracts | Derivatives designated as hedging instruments | Other current assets    
Derivatives, Fair Value [Line Items]    
Derivative Assets 0.4 3.3
Foreign exchange contracts | Derivatives designated as hedging instruments | Other current liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 0.9 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 0.5 1.7
Foreign exchange contracts | Derivatives not designated as hedging instruments | Other Noncurrent Assets    
Derivatives, Fair Value [Line Items]    
Derivative Assets 11.2 12.7
Foreign exchange contracts | Derivatives not designated as hedging instruments | Other Noncurrent Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities $ 11.2 $ 12.7