Derivatives, Hedging Programs and Other Financial Instruments, Balance Sheet (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Derivative Asset	$ 4.3	$ 25.3
Derivative Liability	(15.9)	(0.8)
Other Current Assets
Derivative [Line Items]
Derivative Asset	3.4	18.9
Other Assets
Derivative [Line Items]
Derivative Asset	0.9	6.4
Other Current Liabilities
Derivative [Line Items]
Derivative Liability	(13.2)	(0.3)
Other Noncurrent Liabilities
Derivative [Line Items]
Derivative Liability	$ (2.7)	$ (0.5)