Equity - Schedule of Distributions Declared and/or Paid (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended
	Mar. 29, 2016	Nov. 03, 2014	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015		Dec. 31, 2014
Distribution Made To Limited Partner [Line Items]
Distributions declared and/or paid			$ 41.7	$ 35.3	$ 30.3	$ 27.7	$ 24.1		$ 14.4
Distributions paid per limited partner unit (in dollars per unit)			$ 0.2350	$ 0.2200	$ 0.2050	$ 0.1900	$ 0.1750	[1]	$ 0.1042
Aggregate percentage of general partner interest		2.00%
Shell Pipeline Company L P
Distribution Made To Limited Partner [Line Items]
Distributions declared and/or paid			$ 15.8	$ 14.9	$ 13.9	$ 12.8	$ 11.8		$ 7.1
Aggregate percentage of general partner interest			2.00%
Common Units | General Public
Distribution Made To Limited Partner [Line Items]
Distributions declared and/or paid			$ 17.9	13.8	11.0	10.2	8.0		4.8
Common Units | Shell Pipeline Company L P
Distribution Made To Limited Partner [Line Items]
Distributions declared and/or paid			5.1	4.7	4.4	4.1	3.8		2.2
General Partner
Distribution Made To Limited Partner [Line Items]
Distributions declared and/or paid			$ 0.9	0.7	0.6	0.5	0.5		0.3
Aggregate percentage of general partner interest	2.00%		2.00%
General Partner | General Partner Incentive
Distribution Made To Limited Partner [Line Items]
Distributions declared and/or paid			$ 2.0	$ 1.2	$ 0.4	$ 0.1	$ 0.0		$ 0.0

[1] (1) The 2015 financial information has been retrospectively adjusted for the acquisition of the Shell Auger and Lockport Operations.