Net Income Per Limited Partner Unit (Narrative) (Details) $ / shares in Units, $ in Millions		9 Months Ended
	Oct. 19, 2016 USD ($) $ / shares	Sep. 30, 2016 USD ($) class	Sep. 30, 2015 USD ($)
Number of classes of participating securities | class		1
Subsequent Events [Abstract]
Total distributions attributable to the first quarter of 2016		$ 176.8	$ 107.3
Cash Distribution [Member] | Subsequent Event [Member]
Subsequent Events [Abstract]
Total distributions attributable to the first quarter of 2016	$ 82.5
Common Units [Member] | Cash Distribution [Member] | Subsequent Event [Member]
Subsequent Events [Abstract]
Quarterly cash distribution declared per limited partner unit | $ / shares	$ 0.531