UNAUDITED CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY - 6 months ended Jun. 30, 2017 - USD ($) $ in Millions		Total		Non-controlling Interest	Net Parent Investment		Common units – public	Common units – public Shell Pipeline Company L P	Subordinated Units Shell Pipeline Company L P	General Partner Shell Pipeline Company L P
Beginning Balance at Dec. 31, 2016		$ 336.6	[1],[2]	$ 21.6	$ 216.7	[2]	$ 2,485.7	$ (124.1)	$ (389.6)	$ (1,873.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		143.7	[2],[3],[4]	4.4	3.0	[2]	54.8	55.1		26.4
Other contributions from Parent		11.9	[2]							11.9
Net proceeds from public offering		3.0	[2]				2.9			0.1
Distributions to unitholders and general partner		(122.2)	[2]				(50.2)	(31.8)	(18.7)	(21.5)
Distribution to noncontrolling interest		(6.6)	[2]	(6.6)
Proceeds from April 2017 divestiture		20.2	[2]	1.5						18.7
Expiration of subordinated period								(408.3)	408.3
May 2017 Acquisition		(630.0)	[2]		(210.6)	[2]				(419.4)
Net Assets Not Contributed To The Partnership	[2]	(9.1)			(9.1)
Ending Balance at Jun. 30, 2017		$ (252.5)	[2]	$ 20.9	$ 0.0	[2]	$ 2,493.2	$ (509.1)	$ 0.0	$ (2,257.5)

[1] Prior period financial information has been retrospectively adjusted for the acquisition of the Shell Delta, Na Kika and Refinery Gas Pipeline Operations.

[2] Prior period financial information has been retrospectively adjusted for the acquisition of the Shell Delta, Na Kika and Refinery Gas Pipeline Operations.

[3] The 2017 financial information reflects adjustments for the acquisition of the Shell Delta, Na Kika and Refinery Gas Pipeline Operations from January 1, 2017 through May 9, 2017.

[4] The 2017 financial information reflects adjustments for the acquisition of the Shell Delta, Na Kika and Refinery Gas Pipeline Operations from January 1, 2017 through May 9, 2017.