Related Party Transactions - Schedule of Condensed Combined Statement of Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Related Party Transaction [Line Items]
Operations and maintenance – related parties	$ 5.4	$ 5.2	[1]
General and administrative – related parties	5.7	5.6	[1]
Management Agreement
Related Party Transaction [Line Items]
Payment for general administrative services	1.9	1.8
Omnibus Agreement
Related Party Transaction [Line Items]
Payment for general administrative services	$ 2.1	$ 2.1

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