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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Capital in Excess of Par Value	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss
Cash dividends declared per common share (usd per share)	$ 0.07
Beginning Balance at Dec. 31, 2017	$ 457.4	$ 66.1	$ 207.7	$ 346.6	$ (86.1)	$ (76.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	12.9			12.9
Total other comprehensive (loss) income	2.9					2.9	[1]
Cash dividends declared	(4.2)			(4.2)
Stock-based payments:
Stock-based compensation	0.9		0.9
Stock option exercises and other	0.0	0.0	0.2		(0.2)
Ending Balance at Mar. 31, 2018	$ 469.9	66.1	208.8	355.3	(86.3)	(74.0)
Cash dividends declared per common share (usd per share)	$ 0.08
Beginning Balance at Dec. 31, 2018	$ 530.1	66.4	217.0	432.5	(88.5)	(97.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	17.5			17.5
Total other comprehensive (loss) income	(0.3)					(0.3)	[1]
Cash dividends declared	(4.8)			(4.8)
Stock-based payments:
Stock-based compensation	1.4		1.4
Stock option exercises and other	(0.1)	0.0	0.1		(0.2)
Performance share unit transactions	(0.9)	0.1	(0.1)		(0.9)
Stock repurchase program	(1.0)				(1.0)
Ending Balance at Mar. 31, 2019	548.4	$ 66.5	$ 218.4	451.7	$ (90.6)	$ (97.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Impact of adoption of ASU 2016-02 | Accounting Standards Update 2018-02	$ 6.5			$ 6.5
[1] Amounts in parentheses indicate losses.

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