Consolidated Statements of Shareholders' Equity (Deficit) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Treasury Stock	Non-controlling Interest
Beginning balance (in shares) at Dec. 31, 2015		4,437,789				715,947
Beginning balance at Dec. 31, 2015	$ 24.4	$ 0.4	$ 1,042.0	$ (893.9)	$ (96.1)	$ (28.0)	$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ (125.2)			(125.2)
Purchase of treasury stock (in shares)	24,086					24,086
Purchase of treasury stock	$ (0.2)					$ (0.2)
Exercise of stock options (in shares)	(722)					(722)
Exercise of stock options	$ 0.0					$ 0.0
Restricted stock grants and other (in shares)	4,780					4,780
Restricted stock grants and other	$ 0.6		0.8			$ (0.2)
Contingent consideration in shares	(0.4)		(0.4)
Net change in cumulative translation adjustment	75.0				75.0
Reclassification entry	0.0	$ (0.4)	0.4
Pension adjustments, net of tax	0.5				0.5
Ending balance (in shares) at Dec. 31, 2016		4,437,789				744,091
Ending balance at Dec. 31, 2016	(25.3)	$ 0.0	1,042.8	(1,019.1)	(20.6)	$ (28.4)	0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ (18.6)			(8.4)			(10.2)
Purchase of treasury stock (in shares)	27,950					27,950
Purchase of treasury stock	$ (0.1)					$ (0.1)
Restricted stock grants and other (in shares)	(138,102)					(138,102)
Restricted stock grants and other	$ 0.1		(1.8)			$ 1.9
Issuance of stock for Capacity and Services Transaction with Clinton (in shares)		1,250,000
Issuance of stock for Capacity and Services Transaction with Clinton	10.2	$ 0.1	10.1
Contingent consideration in shares	(0.2)		(0.2)
Net change in cumulative translation adjustment	0.3				0.3
Pension adjustments, net of tax	1.4				1.4
Contribution from non-controlling interest	5.6						5.6
Rounding adjustment	(0.1)						(0.1)
Ending balance (in shares) at Dec. 31, 2017		5,687,789				633,939
Ending balance at Dec. 31, 2017	$ (26.7)	$ 0.1	$ 1,050.9	$ (1,027.5)	$ (18.9)	$ (26.6)	$ (4.7)