FAIR VALUE MEASUREMENTS (Details 3) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Long-term Debt, Fair Value	$ 553.2	$ 552.3	$ 613.1
Notes Payable	527.5	536.4	582.8
Fair Value, Inputs, Level 1 [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Long-term Debt, Fair Value	0	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Long-term Debt, Fair Value	400.2	391.4	488.3
Fair Value, Inputs, Level 3 [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Long-term Debt, Fair Value	$ 153.0	$ 160.9	$ 124.8