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SHORT-TERM DEBT AND LINES OF CREDIT - SHORT-TERM BORROWINGS (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Short-term borrowings      
Short-term borrowings outstanding $ 133.3us-gaap_ShortTermBorrowings   $ 317.6us-gaap_ShortTermBorrowings
Commercial paper      
Short-term borrowings      
Short-term borrowings outstanding 133.3us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_CommercialPaperMember		   317.6us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_CommercialPaperMember
Average interest rate (as a percent) 0.37%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_CommercialPaperMember		   0.36%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_CommercialPaperMember
Average amount of commercial paper borrowings outstanding $ 189.5us-gaap_ShorttermDebtAverageOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_CommercialPaperMember		 $ 247.1us-gaap_ShorttermDebtAverageOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_CommercialPaperMember