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SHORT-TERM DEBT AND LINES OF CREDIT | 3 Months Ended
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Mar. 31, 2018
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) |  | March 31, 2018 |  | December 31, 2017
Commercial paper |  |  |  |
Amount outstanding |  | $ | 1,200.3 |  |  | $ | 1,444.6 |
Weighted-average interest rate on amounts outstanding |  | 2.24 | % |  | 1.77 | %
Our average amount of commercial paper borrowings based on daily outstanding balances during the three months ended March 31, 2018, was $1,254.4 million with a weighted-average interest rate during the period of 1.90%. The information in the table below relates to our revolving credit facilities used to support our commercial paper borrowing programs, including available capacity under these facilities:
(in millions) |  | Maturity |  | March 31, 2018
WEC Energy Group |  | October 2022 |  | $ | 1,200.0 |
WE |  | October 2022 |  | 500.0 |
WPS |  | October 2022 |  | 400.0 |
WG |  | October 2022 |  | 350.0 |
PGL |  | October 2022 |  | 350.0 |
Total short-term credit capacity |  |  |  | $ | 2,800.0 |
Less: |  |  |  |  |
Letters of credit issued inside credit facilities |  |  |  | $ | 1.2 |
Commercial paper outstanding |  |  |  | 1,200.3 |
Available capacity under existing agreements |  |  |  | $ | 1,598.5 |

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- Definition The entire disclosure for short-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 + Details
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