Condensed Consolidated Statement of Stockholders' Equity (USD $) In Millions, unless otherwise specified	Total	Common Stock	Additional Capital	Accumulated Other Comprehensive Income	Retained Earnings
Balance at Dec. 31, 2012	$ 279.9	$ 31.9	$ 252.7	$ (45.5)	$ 40.8
Balance (in shares) at Dec. 31, 2012		42.6
Increase (Decrease) in Stockholders' Equity
Net Income	9.1				9.1
Other comprehensive income	1.3			1.3
Share-based compensation	1.3		1.3
Shares issued	(1.0)	0.1	(1.1)
Shares issued (in shares)		0.1
Dividends	(6.5)				(6.5)
Balance at Mar. 31, 2013	$ 284.1	$ 32.0	$ 252.9	$ (44.2)	$ 43.4
Balance (in shares) at Mar. 31, 2013		42.7