Earnings Per Share, EPS Table (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Numerator:
Net income	$ 4.4	[1]	$ 5.5		$ 20.2	[1]	$ 14.4
Less: Net income attributable to participating securities	0	[2]	0	[2]	0	[2]	(0.1)	[2]
Net income available to common stockholders	$ 4.4		$ 5.5		$ 20.2		$ 14.3
Denominator - Weighted-average common shares outstanding (000):
Basic	18,999		18,941		18,971		19,499
Diluted	18,999		18,941		18,971		19,499
Earnings per common share:
Basic	$ 0.23	[1]	$ 0.29		$ 1.06	[1]	$ 0.74
Diluted	$ 0.23	[1]	$ 0.29		$ 1.06	[1]	$ 0.74

[1] The combined results for the quarter and nine months ended September 30, 2011 are as presented in the Statement of Consolidated Income for such periods, reflecting the January 1, 2011 effective date of the Alexco acquisition (see Note 1).

[2] Net income attributable to participating securities for a given period includes both distributed and undistributed net income, as applicable. Distributed net income attributed to participating securities represents dividend and dividend equivalents declared on the participating securities that the Company expects to ultimately vest. Undistributed net income for a given period, if any, is apportioned to common stockholders and participating securities based on the weighted- average number of securities outstanding in each class during the applicable period as a percentage of the combined weighted-average number of these securities outstanding during the period. Undistributed losses are not allocated to participating securities, however, as the holders of such securities do not have an obligation to fund net losses of the Company.