Other Assets and Liabilities - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Schedule of Other Assets and Liabilities [Line Items]
Crude purchase liabilities	$ 79.4	$ 72.1
Income and other taxes payable	75.4	119.6
Environmental Credits Obligation deficit (see Note 10)	50.2	18.5
Product financing agreements	42.0	21.1
Short-term derivative liabilities (see Note 9)	34.2	14.1
Employee costs	22.2	47.6
Interest payable	11.3	8.8
Environmental liabilities (see Note 11)	8.2	8.2
Tank inspection liabilities, current	5.2	5.6
Accrued Utilities	2.3	4.4
Other	24.3	26.8
Total	354.7	346.8
Long-term derivative liabilities (see Note 9)	$ 1.1	$ 1.4