CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Revenue
Transportation, terminaling and storage services - third parties		$ 235.6	$ 251.5	[1]	$ 268.4	[1]
Transportation, terminaling and storage services - related parties		178.2	188.3	[1]	217.1	[1]
Lease revenue - related parties		56.3	13.1	[1]	0.0	[1]
Total revenue		470.1	452.9	[1]	485.5	[1]
Costs and expenses
Operations and maintenance - third parties		104.1	76.9	[1]	84.8	[1]
Operations and maintenance - related parties		45.6	40.0	[1]	39.0	[1]
Loss from disposition of fixed assets		0.1	0.2	[1],[2]	0.3	[1],[2]
General and administrative - third parties		10.1	9.7	[1]	13.4	[1]
General and administrative - related parties		47.7	43.7	[1]	42.5	[1]
Depreciation, amortization and accretion		45.0	43.1	[1],[2]	37.9	[1],[2]
Property and other taxes		17.4	15.8	[1]	15.0	[1]
Total costs and expenses		270.0	229.4	[1]	232.9	[1]
Operating income		200.1	223.5	[1]	252.6	[1]
Income from equity method investments		186.6	138.1	[1]	104.7	[1]
Dividend income from cost investments		37.4	28.3	[1]	20.6	[1]
Other (loss) income		0.0	(0.1)	[1]	0.3	[1]
Investment, dividend and other income		224.0	166.3	[1]	125.6	[1]
Interest expense, net		32.2	12.3	[1]	4.3	[1]
Income before income taxes		391.9	377.5	[1]	373.9	[1]
Income tax expense (benefit)		0.1	0.0	[1]	(0.1)	[1]
Net income	[3]	391.8	377.5	[1],[2]	374.0	[1],[2]
Less: Net income attributable to the Parent		77.3	102.3	[1]	133.8	[1]
Less: Net income attributable to noncontrolling interests		19.2	30.3	[1]	73.1	[1]
Net income attributable to the Partnership		295.3	244.9	[1]	167.1	[1]
General partner's interest in net income attributable to the Partnership		64.6	25.0	[1]	5.0	[1]
Limited Partners' interest in net income attributable to the Partnership		$ 230.7	$ 219.9	[1]	$ 162.1	[1]
Net income per Limited Partner Unit - Basic and Diluted (in dollars):
Distributions per Limited Partner unit (in dollars per share)		$ 1.2461	$ 1.0258	[1]	$ 0.79	[1]
Weighted average Limited Partner Units outstanding - Basic and Diluted (in millions):
Weighted average limited partner units - Basic and Diluted (in units)		184.1	172.9		143.8
Common Units
Net income per Limited Partner Unit - Basic and Diluted (in dollars):
Net income per Limited Partner Unit - Basic and Diluted (in dollars per share)		$ 1.28	$ 1.32	[1]	$ 1.16	[1]
Common Units | Shell Pipeline Company L P
Weighted average Limited Partner Units outstanding - Basic and Diluted (in millions):
Weighted average limited partner units - Basic and Diluted (in units)		89.0	21.5	[1]	21.5	[1]
Subordinated Units
Net income per Limited Partner Unit - Basic and Diluted (in dollars):
Net income per Limited Partner Unit - Basic and Diluted (in dollars per share)		$ 0.00	$ 1.27	[1]	$ 1.14	[1]
Subordinated Units | Shell Pipeline Company L P
Costs and expenses
Net income		$ 0.0	$ 85.5		$ 76.6
Weighted average Limited Partner Units outstanding - Basic and Diluted (in millions):
Weighted average limited partner units - Basic and Diluted (in units)		0.0	67.5	[1]	67.5	[1]
Common unitholders - public
Costs and expenses
Net income		$ 118.4	$ 107.2		$ 61.1
Weighted average Limited Partner Units outstanding - Basic and Diluted (in millions):
Weighted average limited partner units - Basic and Diluted (in units)		91.4	80.4	[1]	51.9	[1]
Common unitholders - public | Shell Pipeline Company L P
Costs and expenses
Net income		$ 112.3	$ 27.2		$ 24.4

[1] The financial information presented has been retrospectively adjusted for acquisitions of businesses under common control.

[2] The financial information presented has been retrospectively adjusted for acquisitions of businesses under common control.

[3] The financial information presented has been retrospectively adjusted for acquisitions of businesses under common control.