Consolidated Statement of Stockholders' Equity (USD $) In Millions	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning Balance at Dec. 31, 2013	$ 409.4	$ 0.3	$ 308.8	$ (73.3)	$ 327.5	$ (153.9)
Net income	35.4				35.4
Dividend paid ($0.27 per share)	(6.6)				(6.6)
Changes in cumulative translation adjustment	(0.2)					(0.2)
Treasury stock re-issued	0.7		(0.5)	1.2
Treasury stock repurchased	(0.8)			(0.8)
Excess tax benefit from stock-based payment arrangements	0.6		0.6
Stock option compensation	1.2		1.2
Amortization of prior service credit, net of tax	(0.6)					(0.6)
Amortization of actuarial net losses, net of tax	2.2					2.2
Ending Balance at Jun. 30, 2014	$ 441.3	$ 0.3	$ 310.1	$ (72.9)	$ 356.3	$ (152.5)