Derivatives, Hedging Programs and Other Financial Instruments, Balance Sheet (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative asset	$ 6.7	$ 4.3
Derivative liability	(9.2)	(15.9)
Other Current Liabilities
Derivative [Line Items]
Derivative liability	(8.1)	(13.2)
Other Noncurrent Liabilities [Member]
Derivative [Line Items]
Derivative liability	(1.1)	(2.7)
Other Current Assets
Derivative [Line Items]
Derivative asset	4.1	3.4
Other Assets
Derivative [Line Items]
Derivative asset	$ 2.6	$ 0.9