SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS Common Shares (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	12 Months Ended
	Nov. 30, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Common Stock [Member]
Class of Stock [Line Items]
Issuance of Common Shares, net of issuance costs (in Shares)	2,250,000	3,013,000	9,510,000	2,250,000
Proceeds from Issuance of Common Stock	$ 45.0
Stock Issued During Period, Shares, Conversion of Units		93,000	334,000	11,000
At The Market Equity Program [Member]
Class of Stock [Line Items]
Proceeds from Issuance of Common Stock			140.8
At The Market Equity Program [Member] | Common Stock [Member]
Class of Stock [Line Items]
Issuance of Common Shares, net of issuance costs (in Shares)			6,100,000
Public Offering [Member]
Class of Stock [Line Items]
Proceeds from Issuance of Common Stock			85.9
Public Offering [Member] | Common Stock [Member]
Class of Stock [Line Items]
Issuance of Common Shares, net of issuance costs (in Shares)			3,500,000
Common Op Units Conversion To Common Shares [Member] | Common Stock [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, Conversion of Units		1,200,000	250,000
Restricted Stock [Member]
Class of Stock [Line Items]
Restricted Stock, Shares Canceled for Tax Withholding For Share Based Compensation		3,250
LTIP Units and Restricted Stock [Member]
Class of Stock [Line Items]
Allocated Share-based Compensation Expense		7.3	3.6	4.0
Common Shares | New At The Market Equity Program [Member]
Class of Stock [Line Items]
Issuance of Common Shares, net of issuance costs (in Shares)		3,000,000
Proceeds from Issuance of Common Stock		$ 80.7