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Derivatives, Hedging Programs and Other Financial Instruments, Balance Sheet (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Derivative [Line Items]    
Cash and money market funds $ 199.6 $ 28.2
Commercial paper 107.6 236.1
Short-term investments 39.3 78.7
Fair Value, Measurements, Recurring    
Derivative [Line Items]    
Cash and cash equivalents 307.2 264.3
Derivative asset 1.8 4.0
Derivative liability (30.8) (11.2)
Fair Value, Measurements, Recurring | Other Current Liabilities    
Derivative [Line Items]    
Derivative liability (19.0) (7.6)
Fair Value, Measurements, Recurring | Other Noncurrent Liabilities    
Derivative [Line Items]    
Derivative liability (11.8) (3.6)
Fair Value, Measurements, Recurring | Other Current Assets    
Derivative [Line Items]    
Derivative asset 0.6 2.1
Fair Value, Measurements, Recurring | Other Assets    
Derivative [Line Items]    
Derivative asset 1.2 1.9
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring    
Derivative [Line Items]    
Cash and money market funds 199.6 28.2
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring    
Derivative [Line Items]    
Derivative asset 1.8 4.0
Derivative liability (30.8) (11.2)
Derivative Assets (Liabilities), at Fair Value, Net (29.0) (7.2)
Debt Securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring    
Derivative [Line Items]    
Commercial paper 107.6 236.1
Designated as Hedging Instrument | Purchase    
Derivative [Line Items]    
Derivative liability $ (29.2) $ (7.2)