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SHORT-TERM DEBT AND LINES OF CREDIT (Tables)
 12 Months Ended
Dec. 31, 2017
Short-term Debt [Abstract]  
Schedule of short-term borrowings
The following table shows our short-term borrowings and their corresponding weighted-average interest rates as of December 31:
(in millions, except percentages)
 
2017
 
2016
Commercial paper
 


 


Amount outstanding at December 31
 
$
293.1

 
$
176.8

Average interest rate on amounts outstanding at December 31
 
1.72
%
 
1.01
%
Schedule of revolving credit facilities and remaining available capacity
The information in the table below relates to our revolving credit facility used to support our commercial paper borrowing program, including remaining available capacity under this facility as of December 31:
(in millions)
 
Maturity
 
2017
Revolving credit facility *
 
December 2020
 
$
400.0

 
 
 
 
 
Less: commercial paper outstanding
 
 
 
293.1

 
 
 
 
 
Available capacity under existing agreement
 
 
 
$
106.9



*
In February 2018, we received approval from the PSCW to extend the maturity of its facility to October 2022.