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Summary of Significant Accounting Policies Enviromental Costs (Details) (Maximum [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Maximum [Member]
Accrued Environmental Loss Contingencies, Noncurrent	$ 0.1	$ 0.1

Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer.

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