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LONG-TERM DEBT	6 Months Ended
LONG-TERM DEBT	Jun. 30, 2019
Long-term Debt, Unclassified [Abstract]
Long-Term Debt	LONG-TERM DEBT WEC Energy Group, Inc. In March 2019, we issued $350.0 million of 3.10% Senior Notes due March 8, 2022. We used the net proceeds to repay short-term debt, and for working capital and other general corporate purposes. ATC Holding LLC In July 2019, ATC Holding secured commitments for $235.0 million of 3.75% Senior Notes due September 16, 2029. ATC Holding expects to issue the Senior Notes in September 2019. The net proceeds are expected to be used to make a special distribution to WEC Energy Group in order to balance ATC Holding’s capital structure.