UNAUDITED CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY - 9 months ended Sep. 30, 2016 - USD ($) $ in Millions	Total	Noncontrolling Interest	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, 2015	$ 207.1	$ 108.4	$ 1,637.5	$ (130.4)	$ (409.8)	$ (998.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	193.1	17.7	77.4	20.0	62.7	15.3
Net proceeds from public offerings	818.1		818.1
Contributions from general partner	16.9					16.9
Other contribution from parent	1.6					1.6
Distributions to unitholders and general partner	(126.0)		(53.7)	(15.2)	(47.6)	(9.5)
Distribution to noncontrolling interest	(17.1)	(17.1)
Capital distributions to general partner	(606.3)					(606.3)
Acquisition of noncontrolling interest	(87.0)	(87.0)
Ending Balance at Sep. 30, 2016	$ 400.4	$ 22.0	$ 2,479.3	$ (125.6)	$ (394.7)	$ (1,580.6)