Summary of Significant Accounting Policies - Schedule of Revenues (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Third party revenue										$ 251.5		$ 268.4
Related party revenue										188.3		217.1
Lease revenue									$ 56.3	13.1	[1]	0.0	[1]
Total revenue	$ 126.8	$ 121.8	$ 112.4	$ 109.1	$ 115.1	$ 107.7	$ 112.9	$ 117.2	470.1	452.9	[1]	485.5	[1]
Transportation and Terminaling Services
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Third party revenue									226.9	242.9		259.8
Related party revenue									172.2	179.7		209.5
Total revenue									399.1	422.6		469.3
Storage Services
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Third party revenue									8.7	8.6		8.6
Related party revenue									6.0	8.6		7.6
Total revenue									$ 14.7	$ 17.2		$ 16.2

[1] The financial information presented has been retrospectively adjusted for acquisitions of businesses under common control.