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Summary of Significant Accounting Policies Environmental Costs (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Site Contingency [Line Items]
Accrued Environmental Loss Contingencies, Noncurrent	$ 7.5	$ 6.2

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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