Other Assets and Liabilities - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Schedule of Other Assets and Liabilities [Line Items]
Crude purchase liabilities	$ 70.0	$ 72.1
Income and other taxes payable	90.8	119.6
Environmental Credits Obligation deficit (see Note 10)	68.6	18.5
Product financing agreements	83.1	21.1
Short-term derivative liabilities (see Note 9)	23.7	14.1
Employee costs	22.0	47.6
Interest payable	5.2	8.8
Environmental liabilities (see Note 11)	6.6	8.2
Tank inspection liabilities, current	5.1	5.6
Accrued Utilities	4.1	4.4
Other	30.1	26.8
Total	409.3	346.8
Long-term derivative liabilities (see Note 9)	$ 2.8	$ 1.4