Other Assets and Liabilities - Other Current Assets (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Other Assets and Liabilities [Abstract]
Short-term derivative assets (see Note 9)	$ 84.8	$ 30.2
Income and other tax receivable	74.1	61.9
RINs assets	38.9	14.5
Prepaid expenses	21.0	21.9
Biodiesel tax credit (see Note 2)	12.4	97.5
Environmental Credits Obligation surplus (see Note 10)	11.1	16.8
Note receivable - current portion, net of allowance of $3.1 million	8.7	6.2
Financing Receivable, Allowance for Credit Loss	3.1
Commodity investments	4.6	12.1
Other	6.5	7.6
Total	$ 262.1	$ 268.7