Other Assets and Liabilities - Other Current Assets (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Schedule of Other Assets and Liabilities [Line Items]
Total	$ 82.4	$ 49.3
Other Current Assets
Schedule of Other Assets and Liabilities [Line Items]
Prepaid expenses	16.9	14.0
Short-term derivative assets (see Note 16)	17.6	6.8
Income and other tax receivables	19.9	19.2
RINs Obligation surplus (see Note 15)	7.7	4.9
Total	$ 20.3	$ 4.4