In accordance with the provisions of their lease agreement, this element represents allowable charges due a landlord from its tenant. In retail store and office building leases, for example, tenant reimbursements may cover items such as taxes, utilities, and common area expenses.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(e))

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

Name:	us-gaap_TenantReimbursements
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Leasing Activity (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Leasing Activity [Line Items]
Tenant reimbursements	$ 14.6	$ 14.3	$ 44.8	$ 42.5
Percentage of leased asset subjected to termination options	5.80%		5.80%
Percentage of leased asset exercisable in period	2.10%		2.10%
Maximum [Member]
Leasing Activity [Line Items]
Non-cancelable leases term (in years)			10
Minimum [Member]
Leasing Activity [Line Items]
Non-cancelable leases term (in years)			1