Segment Information - Operating Results of Segments and Reconciliations to Loss Before Income taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information
Revenues	$ 332.8	$ 314.9	$ 1,020.1	$ 945.2
Segment Adjusted EBITDA	13.5	16.9	43.0	56.1
Unrealized gains (losses) on derivative financial instruments	0.3	(0.6)	(0.1)	0.9
Segment depreciation and amortization			(33.4)	(36.6)
Amortization of inventories and supplies purchase accounting adjustments				(0.9)
Selling, general and administrative expenses	(12.4)	(18.1)	(39.2)	(48.1)
Goodwill impairment	(33.6)		(33.6)
Other, net	(1.4)	(1.0)	(3.0)	(2.6)
Operating profit (loss)	(34.8)	(3.5)	(34.6)	2.5
Interest expense, net	(9.8)	(9.2)	(30.4)	(27.5)
Change in fair value of common stock warrant liability	0.9	1.9	3.2	2.6
Foreign exchange gains on intercompany loans	1.1		3.3	1.0
Income from equity method investment	2.3		2.9
Other nonoperating expense, net	(0.2)	(0.5)	(0.5)	(0.3)
Income tax expense (benefit)	0.0	0.5	(1.9)	(0.4)
Earnings from discontinued operations, net of income taxes				0.1
Net loss	(40.5)	(10.8)	(58.0)	(22.0)
Operating Segments
Segment Reporting Information
Segment Adjusted EBITDA	13.5	16.9	43.0	56.1
Segment depreciation and amortization	(11.8)	(11.3)	(33.4)	(36.6)
Corporate and Other
Segment Reporting Information
Selling, general and administrative expenses	(1.8)	(7.5)	(7.5)	(14.4)
RANA
Segment Reporting Information
Goodwill impairment	(33.6)		(33.6)
RANA | Operating Segments
Segment Reporting Information
Revenues	213.0	200.5	673.0	613.7
Segment Adjusted EBITDA	5.6	9.0	20.6	36.5
RAEU
Segment Reporting Information
Goodwill impairment	0.0
RAEU | Operating Segments
Segment Reporting Information
Revenues	119.8	114.4	347.1	331.5
Segment Adjusted EBITDA	$ 7.9	$ 7.9	$ 22.4	$ 19.6