FAIR VALUE MEASUREMENTS AND THE FAIR VALUE OPTION (Investments in Joint Ventures) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Equity Method Investments [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
The funds, fair value disclosure	$ 33.5	$ 25.8
Joint Venture Investments Recorded at Fair Value, Fair Value Disclosure	81.1	68.4
Recurring [Member] | Level 3 [Member] | Real Estate Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
The funds, fair value disclosure	33.5	25.8
The funds, unfunded commitments	6.6
Equity Method Investments [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Other Assets, Fair Value Disclosure	$ 47.6	$ 42.6