Significant Risks and Uncertainties (Details) (USD $) In Millions	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Insurance Matters [Abstract]
Minimum insurance deductible per incident	$ 5.0		$ 5.0
Maximum insurance deductible per incident	75.0		75.0
Property damage proceeds	1.5	107.5	1.5	148.5
Business interruption gains	3.7	5.1	3.7	6.2
Loss Contingencies [Line Items]
Estimated property damage insurance claims outstanding	58.1		58.1
February 2011 West Storage Incident [Member]
Loss Contingencies [Line Items]
Estimate of cost related to incident	200.0		200.0
Estimated property damage insurance claims outstanding	$ 52.1		$ 52.1

Represents gains related to business interruption proceeds during the period disclosed.

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Maximum insurance deductible amount per incident.

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Minimum insurance deductible amount per incident.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9, 10, 11, 12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 9

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-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14557-108349

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