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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
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	39.8			39.8
Total other comprehensive (loss) income	(0.4)					(0.4)	[1]
Cash dividends declared	(9.0)			(9.0)
Stock-based payments:
Stock-based compensation	3.3		3.3
Stock option exercises and other	1.3	0.2	1.7		(0.6)
Ending Balance at Jun. 30, 2018	492.4	66.3	212.7	377.4	(86.7)	(77.3)
Beginning Balance at Mar. 31, 2018	469.9	66.1	208.8	355.3	(86.3)	(74.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	26.9			26.9
Total other comprehensive (loss) income	(3.3)					(3.3)	[1]
Cash dividends declared	(4.8)			(4.8)
Stock-based payments:
Stock-based compensation	2.4		2.4
Stock option exercises and other	1.3	0.2	1.5		(0.4)
Ending Balance at Jun. 30, 2018	492.4	66.3	212.7	377.4	(86.7)	(77.3)
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	50.3			50.3
Total other comprehensive (loss) income	1.1					1.1	[1]
Cash dividends declared	(9.6)			(9.6)
Stock-based payments:
Stock-based compensation	3.5		3.5
Stock option exercises and other	0.1	0.2	0.9		(1.0)
Performance share unit transactions	(0.9)	0.1	(0.1)		(0.9)
Stock repurchase program	(1.0)				(1.0)
Ending Balance at Jun. 30, 2019	580.1	66.7	221.3	479.7	(91.4)	(96.2)
Beginning Balance at Mar. 31, 2019	548.4	66.5	218.4	451.7	(90.6)	(97.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	32.8			32.8
Total other comprehensive (loss) income	1.4					1.4	[1]
Cash dividends declared	(4.8)			(4.8)
Stock-based payments:
Stock-based compensation	2.1		2.1
Stock option exercises and other	0.2	0.2	0.8		(0.8)
Ending Balance at Jun. 30, 2019	580.1	$ 66.7	$ 221.3	479.7	$ (91.4)	$ (96.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Impact of adoption of ASU 2016-02 | Accounting Standards Update 2016-02	$ 6.5			$ 6.5
[1] Amounts in parentheses indicate losses.

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