Other Assets and Liabilities Other Current Assets (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Total	$ 51.2	$ 49.3
Other Current Assets
Prepaid expenses	14.2	14.0
Short-term derivative assets	3.4	6.8
Income and other tax receivables	14.5	19.2
RINs Obligation surplus	15.0	4.9
Other	$ 4.1	$ 4.4