Other Assets and Liabilities - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Schedule of Other Assets and Liabilities [Line Items]
Crude purchase liabilities	$ 74.3	$ 72.1
Income and other taxes payable	88.3	119.6
Environmental Credits Obligation deficit (see Note 10)	237.6	18.5
Product financing agreements	168.5	21.1
Short-term derivative liabilities (see Note 9)	16.3	14.1
Employee costs	23.8	47.6
Interest payable	9.6	8.8
Environmental liabilities (see Note 11)	6.6	8.2
Tank inspection liabilities, current	3.1	5.6
Accrued Utilities	3.7	4.4
Other	25.3	26.8
Total	657.1	346.8
Long-term derivative liabilities (see Note 9)	$ 1.8	$ 1.4