Consolidated Statements of Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Treasury Stock
Balance at beginning of year at Dec. 31, 2016		$ 1.4	$ 567.6	$ (162.9)	$ 247.3	$ (62.9)
Balance (in shares) at Dec. 31, 2016		34,960,303
Increase (Decrease) in Stockholders' Equity
Adjustment due to reverse stock split		$ (1.0)	1.0
Stock options exercised and issuance of other stock awards			2.0			3.1
Stock options exercised (in shares)		262,118
Restricted stock, net (in shares)		23,566
Performance shares issued (in shares)		27,877
Stock-based compensation			7.0
Other comprehensive income (loss)				65.5
Net income (loss)	$ 9.4				9.4
Balance at end of year at Dec. 31, 2017	677.5	$ 0.4	577.6	(97.4)	256.7	(59.8)
Balance (in shares) at Dec. 31, 2017		35,273,864
Increase (Decrease) in Stockholders' Equity
Stock options exercised and issuance of other stock awards			(1.0)			2.9
Stock options exercised (in shares)		95,019
Restricted stock, net (in shares)		165,404
Performance shares issued (in shares)		54,546
Stock-based compensation			8.2
Other comprehensive income (loss)				(19.2)
Net income (loss)	(67.1)				(67.1)
Balance at end of year at Dec. 31, 2018	601.3	$ 0.4	584.8	(116.6)	189.6	(56.9)
Balance (in shares) at Dec. 31, 2018		35,588,833
Increase (Decrease) in Stockholders' Equity
Stock options exercised and issuance of other stock awards			(2.1)			2.4
Stock options exercised (in shares)		58,404
Restricted stock, net (in shares)		145,482
Performance shares issued (in shares)		54,860
Common stock repurchases (in shares)		(473,042)
Common stock repurchases		$ 7.4				(7.4)
Stock-based compensation			9.5
Other comprehensive income (loss)				(4.4)
Net income (loss)	46.6				46.6
Balance at end of year at Dec. 31, 2019	$ 645.9	$ 0.4	$ 592.2	$ (121.0)	$ 236.2	$ (61.9)
Balance (in shares) at Dec. 31, 2019		35,374,537