(Deficit) Equity - Schedule of Number of Units Outstanding (Details) - shares			12 Months Ended
	Feb. 06, 2018	Sep. 15, 2017	Dec. 31, 2019	Dec. 31, 2018
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in units)			228,379,369	191,614,662
Units issued in connection with public offering (in units)				36,764,707
June 2019 Acquisition (in units)			9,671,180
Ending balance (in units)			238,050,549	228,379,369
General Partner
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in units)			4,567,588	3,832,293
Units issued in connection with public offering (in units)	510,204	105,510		735,295
June 2019 Acquisition (in units)			193,424
Ending balance (in units)				4,567,588
General Public | Common units - SPLC
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in units)			123,832,233	98,832,233
Units issued in connection with public offering (in units)	25,000,000	5,170,000		25,000,000
June 2019 Acquisition (in units)			0
Ending balance (in units)			123,832,233	123,832,233
Shell Pipeline Company L P | Common units - SPLC
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in units)			99,979,548	88,950,136
Units issued in connection with public offering (in units)				11,029,412
June 2019 Acquisition (in units)			9,477,756
Ending balance (in units)			109,457,304	99,979,548
Shell Pipeline Company L P | General Partner
Increase (Decrease) in Partners' Capital [Roll Forward]
Ending balance (in units)			4,761,012