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FAIR VALUE MEASUREMENTS (Details 3) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Long-term Debt, Fair Value $ 691.7us-gaap_LongTermDebtFairValue $ 684.9us-gaap_LongTermDebtFairValue $ 711.5us-gaap_LongTermDebtFairValue
Notes Payable 673.3us-gaap_NotesPayable 675.1us-gaap_NotesPayable 690.1us-gaap_NotesPayable
Fair Value, Inputs, Level 1      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Long-term Debt, Fair Value 0us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 0us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 0us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Long-term Debt, Fair Value 538.7us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 531.9us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 558.5us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Long-term Debt, Fair Value $ 153.0us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 $ 153.0us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 $ 153.0us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member