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Derivatives, Hedging Programs and Other Financial Instruments, Balance Sheet (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Derivative [Line Items]    
Cash and money market funds $ 29.3 $ 22.9
Commercial paper 142.8 102.7
Short-term investments $ 25.3 36.7
Document Period End Date Sep. 30, 2019  
Fair Value, Measurements, Recurring    
Derivative [Line Items]    
Cash and cash equivalents $ 172.1 125.6
Derivative asset 2.2 4.3
Derivative liability (15.9) (15.9)
Fair Value, Measurements, Recurring | Other Current Liabilities    
Derivative [Line Items]    
Derivative liability (12.8) (13.2)
Fair Value, Measurements, Recurring | Other Noncurrent Liabilities    
Derivative [Line Items]    
Derivative liability (3.1) (2.7)
Fair Value, Measurements, Recurring | Other Current Assets    
Derivative [Line Items]    
Derivative asset 1.2 3.4
Fair Value, Measurements, Recurring | Other Assets    
Derivative [Line Items]    
Derivative asset 1.0 0.9
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring    
Derivative [Line Items]    
Cash and money market funds 29.3 22.9
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring    
Derivative [Line Items]    
Derivative asset 2.2 4.3
Derivative liability (15.9) (15.9)
Debt Securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring    
Derivative [Line Items]    
Commercial paper 142.8 102.7
Short-term investments $ 25.3 $ 36.7