Condensed Consolidated Statements of Stockholders' Equity - 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, 2013	$ 351.0	$ 63.8	$ 177.0	$ 168.9	$ (16.8)	$ (41.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	39.9			39.9
Total other comprehensive loss	(6.5)					(6.5)
Cash dividends declared	(3.8)			(3.8)
Stock-based payments:
Stock-based compensation	3.4		3.4
Stock option exercises and other	2.0	0.3	1.7
Stock repurchase program	(6.7)				(6.7)
Ending Balance at Sep. 30, 2014	379.3	64.1	182.1	205.0	(23.5)	(48.4)
Beginning Balance at Dec. 31, 2014	371.6	64.2	187.0	227.0	(27.1)	(79.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	52.0			52.0
Total other comprehensive loss	(5.3)					(5.3)
Cash dividends declared	(11.3)			(11.3)
Stock-based payments:
Stock-based compensation	4.3		4.3
Stock option exercises and other	0.7	0.1	1.1		(0.5)
Performance share unit transactions	(2.7)	0.5	(0.5)		(2.7)
Excess tax benefit from stock-based compensation	0.5		0.5
Stock repurchase program	(10.6)				(10.6)
Ending Balance at Sep. 30, 2015	$ 399.2	$ 64.8	$ 192.4	$ 267.7	$ (40.9)	$ (84.8)