Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE OF FINANCIAL INSTRUMENTS (Details)

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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Revolving Credit Agreement
 
Short-term debt  
Line of credit maximum borrowing capacity $ 175.0
Letter of credit subfacility
 
Short-term debt  
Line of credit maximum borrowing capacity 75.0
Swingline subfacility
 
Short-term debt  
Line of credit maximum borrowing capacity $ 10.0