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Summary of Significant Accounting Policies - Non-cash Financing Activities (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
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Accounting Policies [Abstract] |  |  |
Expenditures Included In Construction Trade Payables | $ 7.1 | $ 13.7 | $ 31.8

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- Details
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