Segment Disclosures (Segment Reporting Information by Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Total revenue	$ 3,200.4	$ 2,733.1	$ 2,322.0
Operating expense	592.1	569.7	587.8
Cost of product sales	1,119.4	780.0	468.2
Other operating (income) expense	(5.3)	(2.8)	(0.1)
Earnings of non-controlled entities	(147.4)	(154.4)	(153.3)
Operating margin	1,641.6	1,540.6	1,419.4
Depreciation, amortization and impairment expense	292.8	227.9	243.1
G&A expense	240.7	206.3	171.2
Operating profit	1,108.1	1,106.4	1,005.1
Additions to long-lived assets	168.0	140.8	344.4
Total assets	7,707.7	8,030.0	8,197.0
Goodwill	50.4	50.1	50.1
Investments in non-controlled entities	894.0	980.8	1,213.9
Operating Segments
Segment Reporting Information [Line Items]
Additions to long-lived assets	147.8	130.0	333.9
Total assets	7,626.0	7,660.7	7,813.9
Operating Segments | Refined Products
Segment Reporting Information [Line Items]
Total revenue	2,587.9	2,108.8	1,721.1
Operating expense	431.5	416.7	411.8
Cost of product sales	1,020.2	630.1	425.8
Other operating (income) expense	(7.9)	(6.9)	(3.2)
Earnings of non-controlled entities	(23.7)	(34.4)	(32.5)
Operating margin	1,167.8	1,103.3	919.2
Depreciation, amortization and impairment expense	159.2	153.9	159.9
G&A expense	172.6	147.8	123.5
Operating profit	836.0	801.6	635.8
Additions to long-lived assets	115.8	88.9	277.5
Total assets	4,880.3	4,880.0	4,977.0
Goodwill	38.3	38.0	38.0
Investments in non-controlled entities	225.1	232.8	429.2
Operating Segments | Crude Oil
Segment Reporting Information [Line Items]
Total revenue	618.6	630.1	607.5
Operating expense	173.6	165.4	189.2
Cost of product sales	99.2	149.9	42.4
Other operating (income) expense	2.6	4.1	3.1
Earnings of non-controlled entities	(123.7)	(120.0)	(120.8)
Operating margin	466.9	430.7	493.6
Depreciation, amortization and impairment expense	126.7	67.4	76.6
G&A expense	68.1	58.5	47.7
Operating profit	272.1	304.8	369.3
Additions to long-lived assets	32.0	41.1	56.4
Total assets	2,745.7	2,780.7	2,836.9
Goodwill	12.1	12.1	12.1
Investments in non-controlled entities	668.9	748.0	784.7
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Total assets	81.7	69.8	90.4
Intersegment Eliminations
Segment Reporting Information [Line Items]
Total revenue	(6.1)	(5.8)	(6.6)
Operating expense	(13.0)	(12.4)	(13.2)
Cost of product sales	0.0	0.0	0.0
Other operating (income) expense	0.0	0.0	0.0
Earnings of non-controlled entities	0.0	0.0	0.0
Operating margin	6.9	6.6	6.6
Depreciation, amortization and impairment expense	6.9	6.6	6.6
G&A expense	0.0	0.0	0.0
Operating profit	0.0	0.0	0.0
Assets held for sale
Segment Reporting Information [Line Items]
Total assets		299.5	292.7
Transportation and terminals revenue
Segment Reporting Information [Line Items]
Total revenue	1,875.8	1,798.9	1,743.3
Transportation and terminals revenue | Operating Segments | Refined Products
Segment Reporting Information [Line Items]
Total revenue	1,408.2	1,338.5	1,190.4
Transportation and terminals revenue | Operating Segments | Crude Oil
Segment Reporting Information [Line Items]
Total revenue	473.7	466.2	559.5
Transportation and terminals revenue | Intersegment Eliminations
Segment Reporting Information [Line Items]
Total revenue	(6.1)	(5.8)	(6.6)
Product sales revenue
Segment Reporting Information [Line Items]
Total revenue	1,302.4	913.0	557.5
Product sales revenue | Operating Segments | Refined Products
Segment Reporting Information [Line Items]
Total revenue	1,173.1	763.9	524.4
Product sales revenue | Operating Segments | Crude Oil
Segment Reporting Information [Line Items]
Total revenue	129.3	149.1	33.1
Product sales revenue | Intersegment Eliminations
Segment Reporting Information [Line Items]
Total revenue	0.0	0.0	0.0
Affiliate management fee revenue
Segment Reporting Information [Line Items]
Total revenue	22.2	21.2	21.2
Affiliate management fee revenue | Operating Segments | Refined Products
Segment Reporting Information [Line Items]
Total revenue	6.6	6.4	6.3
Affiliate management fee revenue | Operating Segments | Crude Oil
Segment Reporting Information [Line Items]
Total revenue	15.6	14.8	14.9
Affiliate management fee revenue | Intersegment Eliminations
Segment Reporting Information [Line Items]
Total revenue	$ 0.0	$ 0.0	$ 0.0