NOTES, MORTGAGE NOTES AND OBLIGATIONS PAYABLE - Other Indebtedness (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Debt outstanding	$ 1,345.7	$ 1,096.1
Mortgages [Member]
Debt Instrument [Line Items]
Debt outstanding	1.3	1.6
Weighted average interest rate	2.70%
Collateral amount	3.7
Other Payables [Member]
Debt Instrument [Line Items]
Debt outstanding	8.0	11.5
Collateral amount	12.3
Amount of debt collateralized	4.6
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt outstanding	$ 0	$ 0
Minimum [Member] | Other Payables [Member]
Debt Instrument [Line Items]
Interest rate	5.80%
Maximum [Member] | Other Payables [Member]
Debt Instrument [Line Items]
Interest rate	12.20%