CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) - USD ($) $ in Millions	Total	Accumulated Other Comp Income (Loss)	Limited Partner Common Units	General Partner
Beginning balance at Dec. 31, 2014	$ 4,102.3	$ (72.8)	$ 4,095.1	$ 80.0
Add (deduct):
Net Income	118.1		115.7	2.4
Distributions paid	(50.4)		(49.4)	(1.0)
Sale of common units, net of related transaction costs	113.1		113.1
Capital contribution from general partner	2.3			2.3
Other comprehensive income (loss), net of tax	(3.1)	(3.1)
Ending balance at Jun. 30, 2015	4,282.3	(75.9)	4,274.5	83.7
Add (deduct):
Net Income	40.4
Ending balance at Jun. 30, 2015	4,282.3	(75.9)	4,274.5	83.7
Beginning balance at Dec. 31, 2015	4,326.7	(84.3)	4,326.2	84.8
Add (deduct):
Net Income	166.7		163.4	3.3
Distributions paid	(51.1)		(50.1)	(1.0)
Other comprehensive income (loss), net of tax	2.9	2.9
Ending balance at Jun. 30, 2016	4,445.2	(81.4)	4,439.5	87.1
Add (deduct):
Net Income	65.7
Ending balance at Jun. 30, 2016	$ 4,445.2	$ (81.4)	$ 4,439.5	$ 87.1