Selected Quarterly Financial Data (Unaudited) - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Sep. 30, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Biodiesel Tax Credit, Benefit	$ 77.6		$ 24.9	$ 31.1	$ 36.0
Indemnification settlement amount		$ 20.0
Remaining settlement amount received, attributable to remediation costs	16.0
Remaining settlement amount received, attributable to concessions made under Settlement Agreement	$ 4.0