Acquisitions, Alexco Pro Forma Table (Details) (USD $) In Millions, except Per Share data	3 Months Ended			9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010	Sep. 30, 2011		Sep. 30, 2010
Business Acquisition [Line Items]
Net sales (combined)	$ 322.3	[1]	$ 263.4	$ 983.7	[1]	$ 813.3
Pro-forma of Net income (loss)
Net income (combined)	4.4	[1]	5.5	20.2	[1]	14.4
Basic earnings per share (combined)	$ 0.23	[1]	$ 0.29	$ 1.06	[1]	$ 0.74
Diluted earnings per share (combined)	$ 0.23	[1]	$ 0.29	$ 1.06	[1]	$ 0.74
Alexco [Member]
Pro-forma of Net income (loss)
Net sales (combined)			271.9			837.6
Net income (combined)			6.8			18.4
Basic earnings per share (combined)			$ 0.36			$ 0.94
Diluted earnings per share (combined)			$ 0.36			$ 0.94
Net Sales	11.2			32.3
Net Income before income taxes	$ 2.8			$ 8.2

[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).