Notes Receivable From Real Estate Joint Ventures And Partnerships (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Notes Receivable From Real Estate Joint Ventures And Partnerships [Abstract]
Interest rate on notes receivable - range minimum			2.80%		2.00%
Interest rate on notes receivable - range maximum			5.70%		12.00%
Notes receivable due at various dates through			2014
Interest income on notes receivable	$ 0.8	$ 1.0	$ 2.5	$ 3.3
Allowance for uncollectible notes receivable	0		0		0
Extinguishment of notes receivable			$ 21.9

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For an unclassified balance sheet, the valuation allowance relating to a written agreement to receive money (at a specified future date(s), consisting of principal as well as any accrued interest) for the portion that is expected to be uncollectible.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Article 9

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Income derived from investments in debt securities and on cash and cash equivalents the earnings of which reflect the time value of money or transactions in which the payments are for the use or forbearance of money.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 5

-Section 03

-Paragraph 7

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 14

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.7(b))

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

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- Definition

Gross amount of related party receivable extinguished.

+ Details

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- Definition

The stated final maturity date for a group of loan receivables.

+ Details

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- Definition

When presenting a range of either fixed or variable rates of interest that are charged to borrowers on the carrying amount of loans, the highest stated (contractual) rate under the agreement as of the balance sheet date.

+ Details

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- Definition

When presenting a range of either fixed or variable rates of interest that are charged to borrowers on the carrying amount of loans, the lowest stated (contractual) rate under the agreement as of the balance sheet date.

+ Details

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