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Commitments and Contingencies Additional information (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
Accrued Environmental Liabilities	$ 5.6	$ 8.4
Maximum Annual Repurchase Obligation	$ 4.2

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

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