Inventory - Carrying Value (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Inventory [Line Items]
Feedstocks, raw materials and supplies	$ 528.3	$ 643.5
Refined products and blendstock	618.9	845.6
Merchandise inventory and other	32.0	29.4
Total	1,179.2	1,518.5
Titled Inventory
Inventory [Line Items]
Feedstocks, raw materials and supplies	371.6	479.7
Refined products and blendstock	283.7	490.8
Merchandise inventory and other	32.0	29.4
Total	687.3	999.9
Inventory Intermediation Agreement
Inventory [Line Items]
Feedstocks, raw materials and supplies	156.7	163.8
Refined products and blendstock	335.2	354.8
Merchandise inventory and other	0.0	0.0
Total	$ 491.9	$ 518.6