Equity (Tables)

9 Months Ended

Sep. 30, 2017

Equity [Abstract]

Schedule of Changes in Number of Units Outstanding

The changes in the number of units outstanding from December 31, 2016 through September 30, 2017 are as follows:

	Public	SPLC	SPLC		General
(in units)	Common	Common	Subordinated		Partner	Total
Balance as of December 31, 2016	88,367,308	21,475,068	67,475,068		3,618,723	180,936,167
Expiration of subordination period	—	67,475,068	(67,475,068	)	—	—
Units issued in connection with ATM program	5,294,925	—	—		108,060	5,402,985
Units issued in connection with public offering	5,170,000	—	—		105,510	5,275,510
Balance as of September 30, 2017	98,832,233	88,950,136	—		3,832,293	191,614,662

Schedule of Distributions Declared and/or Paid

The following table details the distributions declared and/or paid for the periods presented:

Date Paid or		Public		SPLC		SPLC		General Partner						Distributions per Limited Partner Unit
to be Paid	Three Months Ended	Common		Common		Subordinated		IDR's		2%		Total
		(in millions, except per unit amounts)
February 11, 2016	December 31, 2015	$	13.9	$	4.7	$	14.8	$	1.2	$	0.7	$	35.3	$	0.22000
May 12, 2016	March 31, 2016	17.9		5.1		15.8		2.0		0.9		41.7		0.23500
August 12, 2016	June 30, 2016	22.0		5.4		16.9		3.7		1.0		49.0		0.25000
November 14, 2016	September 30, 2016	23.3		5.7		17.8		6.0		1.1		53.9		0.26375
February 14, 2017	December 31, 2016	24.5		5.9		18.7		8.3		1.2		58.6		0.27700
May 12, 2017	March 31, 2017	25.7		25.9		—		10.7		1.3		63.6		0.29100
August 14, 2017	June 30, 2017	26.9		27.0		—		12.9		1.4		68.2		0.30410
November 14, 2017	September 30, 2017 (1)	31.4		28.3		—		16.2		1.5		77.4		0.31800

⁽¹⁾ For more information see Note 12— Subsequent Events.