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LONG-TERM DEBT	3 Months Ended
LONG-TERM DEBT	Mar. 31, 2021
Long-term Debt, Unclassified [Abstract]
LONG-TERM DEBT	LONG-TERM DEBT WEC Energy Group, Inc. In March 2021, we issued $600.0 million of 0.80% Senior Notes due March 15, 2024, and used the net proceeds to repay the $340.0 million 364-day term loan entered into in March 2020 and for general corporate purposes.