Consolidated Statements of Shareholders' Equity (Deficit) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Treasury Stock
Beginning balance at Dec. 31, 2014	$ 240.8	$ 0.4	$ 1,034.6	$ (699.9)	$ (84.8)	$ (9.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(194.0)			(194.0)
Purchase of treasury stock	(1.7)					(1.7)
Restricted stock grants and other	0.6		3.8			(3.2)
Value of shares received in TDK transaction	(13.6)					(13.6)
Issuance of stock for acquisition	2.6		2.6
Contingent consideration in shares	0.6		0.6
Stock-based compensation related to options	0.4		0.4
Net change in cumulative translation adjustment	(6.7)				(6.7)
Cash flow hedging, net of tax	(5.1)				(5.1)
Pension adjustments, net of tax	0.5				0.5
Ending balance at Dec. 31, 2015	24.4	0.4	1,042.0	(893.9)	(96.1)	(28.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(125.2)			(125.2)
Purchase of treasury stock	(0.2)					(0.2)
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
Pension adjustments, net of tax	0.5				0.5
Reclassification entry	0.0	(0.4)	0.4
Ending balance at Dec. 31, 2016	$ (25.3)	$ 0.0	$ 1,042.8	$ (1,019.1)	$ (20.6)	$ (28.4)