Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (USD $) In Millions, except Share data, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2012	$ 511.8	$ 3.1	$ 41.0	$ (0.3)	$ 483.4	$ (15.4)
Balance (in Shares) at Dec. 31, 2012		31,209,866		8,760
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	56.7				56.7
Other comprehensive income (loss), net of tax	(20.2)					(20.2)
Dividends declared	(18.8)				(18.8)
Restricted stock issuances, net	0		(0.2)	0.2
Restricted stock issuances, net (in shares)		208,061		5,000
Stock-based employee compensation expense	0.8		0.8
Excess tax benefits of stock-based employee compensation	0.5		0.5
Stock issued to directors as compensation	0.1		0.1
Stock issued to directors as compensation (in shares)		771
Issuance of shares for options exercised	0.3		0.3
Stock Repurchased and Retired During Period, Shares		(47,218)
Treasury Stock, Retired, Cost Method, Amount	0
Issuance of shares for options exercised (in shares)		21,000
Purchases of treasury stock	(1.7)			(1.7)
Purchases of treasury stock (in shares)				(43,458)
Stock Issued During Period, Value, Treasury Stock Reissued			(1.8)	1.8
Stock Issued During Period, Shares, Treasury Stock Reissued				47,218
Balance at Jun. 30, 2013
Balance at Dec. 31, 2013	561.4	3.1	43.3	0	520.0	(5.0)
Balance (in Shares) at Dec. 31, 2013		31,423,427		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	48.2				48.2
Other comprehensive income (loss), net of tax	6.5					6.5
Dividends declared	(22.0)				(22.0)
Restricted stock issuances, net	0		0	0
Restricted stock issuances, net (in shares)		198,180		0
Stock-based employee compensation expense	3.0		3.0
Excess tax benefits of stock-based employee compensation	0.6		0.6
Stock issued to directors as compensation	0		0
Stock issued to directors as compensation (in shares)		1,138
Stock Repurchased and Retired During Period, Shares		(1,161,812)
Stock Repurchased and Retired During Period, Value		(0.1)	0		(52.5)
Purchases of treasury stock	(52.6)			0
Purchases of treasury stock (in shares)				0
Balance at Jun. 30, 2014	$ 545.1	$ 3.0	$ 46.9	$ 0	$ 493.7	$ 1.5
Balance (in Shares) at Jun. 30, 2014		30,460,933		0