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SEGMENT INFORMATION (Details) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Jun. 30, 2022 USD ($) segment	Jun. 30, 2021 USD ($)
Segment information
Number of reportable segments | segment					6
Total operating revenues	$ 2,127.9		$ 1,676.2		$ 5,036.0	$ 4,367.6
Other operation and maintenance	449.0		463.8		903.4	943.7
Depreciation and amortization	279.6		266.2		557.7	527.6
Equity in earnings of transmission affiliates	43.0		41.3		84.7	83.9
Interest expense	119.8		120.0		237.4	239.5
Income tax expense (benefit)	63.4		54.1		190.5	129.0
Net income (loss)	287.8		275.7		855.8	786.0
Net income (loss) attributed to common shareholders	287.5	$ 565.9	276.0	$ 510.1	853.4	786.1
External Revenues
Segment information
Total operating revenues	2,127.9		1,676.2		5,036.0	4,367.6
Intersegment Revenues
Segment information
Total operating revenues	0.0		0.0		0.0	0.0
Utility Operations
Segment information
Other operation and maintenance	439.9		458.1		890.7	932.5
Depreciation and amortization	255.3		243.2		509.2	481.3
Equity in earnings of transmission affiliates	0.0		0.0		0.0	0.0
Interest expense	156.8		157.9		314.1	316.0
Income tax expense (benefit)	71.4		39.9		219.3	137.8
Net income (loss)	207.8		192.9		641.1	586.3
Net income (loss) attributed to common shareholders	207.5		192.6		640.5	585.7
Utility Operations | External Revenues
Segment information
Total operating revenues	2,099.7		1,655.1		4,965.0	4,323.5
Utility Operations | Intersegment Revenues
Segment information
Total operating revenues	0.0		0.0		0.0	0.0
Reconciling Eliminations
Segment information
Other operation and maintenance	(3.9)		(3.9)		(5.5)	(5.5)
Depreciation and amortization	(16.8)		(14.7)		(33.1)	(29.0)
Equity in earnings of transmission affiliates	0.0		0.0		0.0	0.0
Interest expense	(83.8)		(85.2)		(168.2)	(170.9)
Income tax expense (benefit)	0.0		0.0		0.0	0.0
Net income (loss)	0.0		0.0		0.0	0.0
Net income (loss) attributed to common shareholders	0.0		0.0		0.0	0.0
Reconciling Eliminations | External Revenues
Segment information
Total operating revenues	0.0		0.0		0.0	0.0
Reconciling Eliminations | Intersegment Revenues
Segment information
Total operating revenues	$ (115.5)		(112.5)		$ (232.4)	(227.2)
ATC Holdco
Segment information
Equity method investment, ownership interest (as a percent)	75.00%				75.00%
Equity in earnings of transmission affiliates	$ 0.4		0.6		$ 1.1	1.5
Wisconsin
Segment information
Total operating revenues	1,557.4		1,307.5		3,499.7	3,039.2
Wisconsin | Utility Operations
Segment information
Other operation and maintenance	337.9		346.1		650.5	688.0
Depreciation and amortization	187.7		179.8		374.8	356.0
Equity in earnings of transmission affiliates	0.0		0.0		0.0	0.0
Interest expense	135.6		139.8		271.9	279.9
Income tax expense (benefit)	49.3		23.1		144.7	71.2
Net income (loss)	148.7		146.8		437.1	403.4
Net income (loss) attributed to common shareholders	148.4		146.5		436.5	402.8
Wisconsin | Utility Operations | External Revenues
Segment information
Total operating revenues	1,557.4		1,307.5		3,499.7	3,039.2
Wisconsin | Utility Operations | Intersegment Revenues
Segment information
Total operating revenues	0.0		0.0		0.0	0.0
Illinois
Segment information
Total operating revenues	442.4		275.5		1,124.5	978.9
Illinois | Utility Operations
Segment information
Other operation and maintenance	79.1		90.8		192.7	200.1
Depreciation and amortization	57.4		54.0		114.2	106.7
Equity in earnings of transmission affiliates	0.0		0.0		0.0	0.0
Interest expense	18.0		16.6		35.7	33.1
Income tax expense (benefit)	21.2		16.0		63.3	57.4
Net income (loss)	56.4		43.6		169.8	155.7
Net income (loss) attributed to common shareholders	56.4		43.6		169.8	155.7
Illinois | Utility Operations | External Revenues
Segment information
Total operating revenues	442.4		275.5		1,124.5	978.9
Illinois | Utility Operations | Intersegment Revenues
Segment information
Total operating revenues	0.0		0.0		0.0	0.0
Other States
Segment information
Total operating revenues	99.9		72.1		340.8	305.4
Other States | Utility Operations
Segment information
Other operation and maintenance	22.9		21.2		47.5	44.4
Depreciation and amortization	10.2		9.4		20.2	18.6
Equity in earnings of transmission affiliates	0.0		0.0		0.0	0.0
Interest expense	3.2		1.5		6.5	3.0
Income tax expense (benefit)	0.9		0.8		11.3	9.2
Net income (loss)	2.7		2.5		34.2	27.2
Net income (loss) attributed to common shareholders	2.7		2.5		34.2	27.2
Other States | Utility Operations | External Revenues
Segment information
Total operating revenues	99.9		72.1		340.8	305.4
Other States | Utility Operations | Intersegment Revenues
Segment information
Total operating revenues	0.0		0.0		0.0	0.0
Electric Transmission
Segment information
Other operation and maintenance	0.0		0.0		0.0	0.0
Depreciation and amortization	0.0		0.0		0.0	0.0
Equity in earnings of transmission affiliates	43.0		41.3		84.7	83.9
Interest expense	4.8		4.8		9.7	9.7
Income tax expense (benefit)	9.3		9.4		18.2	19.2
Net income (loss)	29.0		27.0		56.8	55.0
Net income (loss) attributed to common shareholders	29.0		27.0		56.8	55.0
Electric Transmission | External Revenues
Segment information
Total operating revenues	0.0		0.0		0.0	0.0
Electric Transmission | Intersegment Revenues
Segment information
Total operating revenues	$ 0.0		0.0		$ 0.0	0.0
Electric Transmission | ATC
Segment information
Equity method investment, ownership interest (as a percent)	60.00%				60.00%
Electric Transmission | ATC Holdco
Segment information
Equity method investment, ownership interest (as a percent)	75.00%				75.00%
Non-Utility Energy Infrastructure
Segment information
Natural gas storage needs provided to Wisconsin utilities					33.00%
Total operating revenues	$ 143.6		133.5		$ 303.1	271.1
Other operation and maintenance	13.9		12.4		24.8	21.3
Depreciation and amortization	34.3		31.3		68.3	62.3
Equity in earnings of transmission affiliates	0.0		0.0		0.0	0.0
Interest expense	17.4		17.9		34.6	35.9
Income tax expense (benefit)	(7.3)		0.7		(12.2)	0.8
Net income (loss)	80.3		68.2		173.6	139.5
Net income (loss) attributed to common shareholders	80.3		68.8		171.8	140.2
Non-Utility Energy Infrastructure | External Revenues
Segment information
Total operating revenues	28.1		21.0		70.7	43.9
Non-Utility Energy Infrastructure | Intersegment Revenues
Segment information
Total operating revenues	$ 115.5		112.5		$ 232.4	227.2
Non-Utility Energy Infrastructure | Bishop Hill III
Segment information
WEC's ownership interest	90.00%				90.00%
Non-Utility Energy Infrastructure | Coyote Ridge
Segment information
WEC's ownership interest	80.00%				80.00%
Non-Utility Energy Infrastructure | Upstream
Segment information
WEC's ownership interest	90.00%				90.00%
Non-Utility Energy Infrastructure | Blooming Grove
Segment information
WEC's ownership interest	90.00%				90.00%
Non-Utility Energy Infrastructure | Tatanka Ridge
Segment information
WEC's ownership interest	85.00%				85.00%
Non-Utility Energy Infrastructure | Jayhawk
Segment information
WEC's ownership interest	90.00%				90.00%
Corporate and Other
Segment information
Total operating revenues	$ 0.1		0.1		$ 0.3	0.2
Other operation and maintenance	(0.9)		(2.8)		(6.6)	(4.6)
Depreciation and amortization	6.8		6.4		13.3	13.0
Equity in earnings of transmission affiliates	0.0		0.0		0.0	0.0
Interest expense	24.6		24.6		47.2	48.8
Income tax expense (benefit)	(10.0)		4.1		(34.8)	(28.8)
Net income (loss)	(29.3)		(12.4)		(15.7)	5.2
Net income (loss) attributed to common shareholders	(29.3)		(12.4)		(15.7)	5.2
Corporate and Other | External Revenues
Segment information
Total operating revenues	0.1		0.1		0.3	0.2
Corporate and Other | Intersegment Revenues
Segment information
Total operating revenues	$ 0.0		$ 0.0		$ 0.0	$ 0.0

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