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SHORT-TERM DEBT AND LINES OF CREDIT
9 Months Ended
Sep. 30, 2021
Short-term Debt [Abstract]  
SHORT-TERM DEBT AND LINES OF CREDIT SHORT-TERM DEBT AND LINES OF CREDIT
The following table shows our short-term borrowings and their corresponding weighted-average interest rates:
(in millions, except percentages)September 30, 2021December 31, 2020
Commercial paper
Amount outstanding$22.5 $292.0 
Weighted-average interest rate on amounts outstanding0.15 %0.21 %

Our average amount of commercial paper borrowings based on daily outstanding balances during the nine months ended September 30, 2021 was $190.6 million with a weighted-average interest rate during the period of 0.17%.

The information in the table below relates to our revolving credit facility used to support our commercial paper borrowing program, including available capacity under this facility:
(in millions)MaturitySeptember 30, 2021
Revolving credit facility (1)
September 2026$500.0 
Less: 
Letters of credit issued inside credit facility$1.0 
Commercial paper outstanding 22.5 
Available capacity under existing credit facility $476.5 

(1)    In September 2021, we extended the maturity of our credit facility to September 2026.