Commitments And Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	1 Months Ended		12 Months Ended
	Oct. 21, 2009 years	Nov. 30, 2010 T	May 31, 2010 years	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Commitments And Contingencies [Abstract]
Total rent expense				$ 2.1	$ 2.0	$ 2.3
Surety bonds				15.7	27.9
Standby letters of credit				0.8	0.8
Aggregate environmental-related accruals				1.5	1.6
Dispute settlement				9.0
Strategic alliance agreement reimbursement period, in years	3
Extension to strategic alliance agreement reimbursement period, in years			3
Amount not to be exceeded in first year						14.0
Amount not to be exceeded in second year					12.0
Standby guarantee liability				$ 0.8	$ 0.8
Product amount to be sold or delivered, in tons		3,900,000
Beneficial owner of the company's common stock				5.00%