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Summary of Significant Accounting Policies - Non-cash Financing Activities (Details) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Accounting Policies [Abstract] | |||
| Expenditures Included In Construction Trade Payables | $ 7.1 | $ 13.7 | $ 31.8 |
| X | ||||||||||
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- Definition
Expenditures Included In Construction Trade Payables No definition available.
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| X | ||||||||||
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- Details
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