Equity - Preferred Units - Additional Information (Details) $ / shares in Units, $ in Millions		3 Months Ended	6 Months Ended
	Aug. 11, 2016 USD ($) $ / shares shares	Jun. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)
Class of Stock [Line Items]
Preferred Units, Issued | shares	11,627,906
Proceeds from sale of convertible preferred units, net of offering costs	$ 25.0
Price per share for preferred units (in dollars per share) | $ / shares	$ 2.15
Proceeds from issuance of preferred stock (net of offering costs)	$ 24.6
Issuance costs	0.4
Net proceeds allocated, fair value basis, to Preferred Units	18.6
Allocation of value to beneficial conversion feature of Class A convertible preferred units	$ 6.0
Accretion period for beneficial conversion			5 years
Accretion of beneficial conversion		$ 0.2	$ 0.5
Days after quarter end distribution paid	45 days
Preferred units distribution accrued			$ 0.5
Conversion period	5 years
Number of days within closing date	90 days
Number of days after closing date	180 days
Cash Dividends [Member]
Class of Stock [Line Items]
Dividend rate (percentage)	8.00%
In Kind Dividends [Member]
Class of Stock [Line Items]
Dividend rate (percentage)	10.00%
Preferred Units
Class of Stock [Line Items]
Conversion ratio		1	1