Revolving Credit Facilities, Term Loan, Mortgages Payable and Scheduled Principal Repayments (Tables)

12 Months Ended

Dec. 31, 2011

Revolving Credit Facilities, Term Loan, Mortgages Payable and Scheduled Principal Repayments [Abstract]

Information Regarding the Company's Revolving Credit Facilities, Term Loan and mortgages payable

	Carrying Value at December 31,				Weighted- Average Interest Rate at December 31,						Maturity Date
	2011		2010		2011			2010
Unsecured indebtedness:
Unsecured Credit Facility	$	102.4	$	279.9		2.7	%		3.5	%		February 2016
PNC Facility		40.0		—		1.9	%		—			February 2016
Secured indebtedness:
Term Loan		500.0		600.0		3.0	%		2.2	%		September 2014
Mortgage and other secured indebtedness — Fixed Rate		1,230.4		1,226.0		5.4	%		5.6	%		July 2012 - February 2022
Mortgage and other secured indebtedness — Variable Rate		91.0		144.1		2.0	%		3.5	%		January 2012 - December 2037
Tax-exempt certificates — Fixed Rate		1.0		8.5		6.9	%		7.1	%		February 2016

Scheduled Principal Repayments

Year	Amount
2012	$	545,938
2013		389,549
2014		819,347
2015		498,282
2016		507,823
Thereafter		1,330,301
	$	4,091,240
Fair market value of assumed debt		13,344
Total indebtedness	$	4,104,584