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LONG-TERM DEBT	9 Months Ended
LONG-TERM DEBT	Sep. 30, 2020
Long-term Debt, Unclassified [Abstract]
LONG-TERM DEBT	LONG-TERM DEBT WEC Energy Group, Inc. In May 2020, we redeemed at par all $400.0 million outstanding of our 2.45% Senior Notes due June 15, 2020. In September 2020, we issued $700.0 million of 0.55% Senior Notes due September 15, 2023, and used the net proceeds to repay commercial paper and for working capital and other general corporate purposes. In October 2020, we issued $500.0 million of 1.375% Senior Notes due October 15, 2027, and $450.0 million of 1.800% Senior Notes due October 15, 2030. We used the net proceeds to redeem our $600.0 million of 3.375% Senior Notes due June 15, 2021 and our $350.0 million of 3.10% Senior Notes due March 8, 2022, and for other general corporate purposes. As a result of redeeming our 3.375% Senior Notes and our 3.10% Senior Notes prior to their maturity dates, we recognized a $27.9 million loss on early extinguishment of debt in October 2020. The loss is comprised of the make-whole premium associated with the early redemptions and the write-off of unamortized debt discounts and debt issuance costs as of the redemption date. The Peoples Gas Light and Coke Company In August 2020, PGL redeemed at par all $50.0 million outstanding of its 1.875% Series WW Bonds due February 1, 2033. Minnesota Energy Resources Corporation In April 2020, MERC issued $50.0 million of 2.69% Senior Notes due May 1, 2025, and used the net proceeds to repay intercompany short-term debt to its parent, Integrys, and for general corporate purposes, including capital expenditures. Michigan Gas Utilities Corporation In April 2020, MGU issued $60.0 million of 2.69% Senior Notes due May 1, 2025, and used the net proceeds to repay intercompany short-term debt to its parent, Integrys, and for general corporate purposes, including capital expenditures.