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LONG-TERM DEBT	6 Months Ended
LONG-TERM DEBT	Jun. 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. 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.