Segment and Geographic Information - Operating Results of Segments and Reconciliations to Loss Before Income taxes (Details) - USD ($) $ in Millions	3 Months Ended								9 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	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information
Revenues	$ 326.3	$ 332.8	$ 350.2	$ 337.1	$ 304.5	$ 314.9	$ 320.9	$ 309.4		$ 1,346.4	$ 1,249.7	$ 1,145.6
Segment Adjusted EBITDA										59.6	67.9	70.3
Unrealized gains (losses) on derivative financial instruments										(0.2)	1.0	(0.8)
Segment depreciation and amortization										(45.1)	(48.5)	(32.5)
Amortization of inventories and supplies purchase accounting adjustments											(1.1)	(9.2)
Selling, general and administrative expenses										(52.3)	(61.0)	(56.0)
Goodwill impairment		(33.6)			(61.8)					(33.6)	(61.8)	0.0
Identifiable intangible asset impairment	(10.1)									(10.1)	(0.1)	0.0
Property, plant and equipment impairment	(40.5)									(40.5)
Other, net										(4.3)	(6.6)	(3.7)
Operating profit (loss)	(49.9)	$ (34.8)	$ 3.8	$ (3.6)	$ (67.2)	$ (3.5)	$ 8.1	$ (2.1)		(84.5)	(64.7)	10.2
Interest expense, net										(41.7)	(37.3)	(34.9)
Change in fair value of common stock warrant liability										4.4	2.4	(1.5)
Acquisition-related costs and expenses											(1.0)	(14.8)
Foreign exchange gains (losses) on intercompany loans										2.4	(2.4)	(1.3)
Earnings (loss) from equity method investment										2.9	(1.1)
Reorganization items, net	$ (11.7)									(11.7)
Other nonoperating expense (income), net										(0.4)	0.3	1.5
Income tax benefit										7.8	0.6	9.1
Earnings (loss) from discontinued operations, net of income taxes											0.6	24.9
Net loss									$ (58.0)	(120.8)	(102.6)	(6.8)
Corporate and Other
Segment Reporting Information
Revenues											0.1
Selling, general and administrative expenses										(10.3)	(15.5)	(13.9)
RANA
Segment Reporting Information
Goodwill impairment										(33.6)	(61.8)
Identifiable intangible asset impairment										(10.1)
RANA | Operating Segments
Segment Reporting Information
Revenues										887.1	821.0	711.4
Segment Adjusted EBITDA										33.2	44.0	49.0
RAEU | Operating Segments
Segment Reporting Information
Revenues										459.3	428.6	434.2
Segment Adjusted EBITDA										$ 26.4	$ 23.9	$ 21.3