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SEGMENT INFORMATION (Details) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2022 USD ($) segment	Sep. 30, 2021 USD ($)
Segment information
Number of reportable segments | segment							6
Total operating revenues	$ 2,003.0			$ 1,746.5			$ 7,039.0	$ 6,114.1
Other operation and maintenance	454.3			473.7			1,357.7	1,417.4
Depreciation and amortization	280.3			271.6			838.0	799.2
Equity in earnings of transmission affiliates	63.7			42.3			148.4	126.2
Interest expense	127.5			118.0			364.9	357.5
Income tax expense (benefit)	73.4			50.8			263.9	179.8
Net income (loss)	301.7			288.7			1,157.5	1,074.7
Net income (loss) attributed to common shareholders	302.0	$ 287.5	$ 565.9	290.0	$ 276.0	$ 510.1	1,155.4	1,076.1
External Revenues
Segment information
Total operating revenues	2,003.0			1,746.5			7,039.0	6,114.1
Intersegment Revenues
Segment information
Total operating revenues	0.0			0.0			0.0	0.0
Utility Operations
Segment information
Other operation and maintenance	450.3			469.9			1,341.0	1,402.4
Depreciation and amortization	257.4			249.4			766.6	730.7
Equity in earnings of transmission affiliates	0.0			0.0			0.0	0.0
Interest expense	158.6			156.0			472.7	472.0
Income tax expense (benefit)	67.6			39.6			286.9	177.4
Net income (loss)	204.0			214.2			845.1	800.5
Net income (loss) attributed to common shareholders	203.7			213.9			844.2	799.6
Utility Operations | External Revenues
Segment information
Total operating revenues	1,976.3			1,727.6			6,941.3	6,051.1
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	(1.6)			(1.6)			(7.1)	(7.1)
Depreciation and amortization	(17.3)			(15.3)			(50.4)	(44.3)
Equity in earnings of transmission affiliates	0.0			0.0			0.0	0.0
Interest expense	(83.9)			(85.1)			(252.1)	(256.0)
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	$ (113.3)			(110.8)			$ (345.7)	(338.0)
ATC
Segment information
Equity method investment, ownership interest (as a percent)	60.00%						60.00%
Equity in earnings of transmission affiliates	$ 63.2			41.7			$ 146.8	124.1
ATC Holdco
Segment information
Equity method investment, ownership interest (as a percent)	75.00%						75.00%
Equity in earnings of transmission affiliates	$ 0.5			0.6			$ 1.6	2.1
Wisconsin
Segment information
Total operating revenues	1,676.8			1,458.6			5,176.5	4,497.8
Wisconsin | Utility Operations
Segment information
Other operation and maintenance	329.1			359.1			979.6	1,047.1
Depreciation and amortization	189.2			184.4			564.0	540.4
Equity in earnings of transmission affiliates	0.0			0.0			0.0	0.0
Interest expense	137.2			137.9			409.1	417.8
Income tax expense (benefit)	63.7			33.6			208.4	104.8
Net income (loss)	195.2			197.8			632.3	601.2
Net income (loss) attributed to common shareholders	194.9			197.5			631.4	600.3
Wisconsin | Utility Operations | External Revenues
Segment information
Total operating revenues	1,676.8			1,458.6			5,176.5	4,497.8
Wisconsin | Utility Operations | Intersegment Revenues
Segment information
Total operating revenues	0.0			0.0			0.0	0.0
Illinois
Segment information
Total operating revenues	230.3			216.2			1,354.8	1,195.1
Illinois | Utility Operations
Segment information
Other operation and maintenance	100.2			91.2			292.9	291.3
Depreciation and amortization	57.9			55.4			172.1	162.1
Equity in earnings of transmission affiliates	0.0			0.0			0.0	0.0
Interest expense	18.1			16.5			53.8	49.6
Income tax expense (benefit)	5.8			7.0			69.1	64.4
Net income (loss)	14.9			19.1			184.7	174.8
Net income (loss) attributed to common shareholders	14.9			19.1			184.7	174.8
Illinois | Utility Operations | External Revenues
Segment information
Total operating revenues	230.3			216.2			1,354.8	1,195.1
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	69.2			52.8			410.0	358.2
Other States | Utility Operations
Segment information
Other operation and maintenance	21.0			19.6			68.5	64.0
Depreciation and amortization	10.3			9.6			30.5	28.2
Equity in earnings of transmission affiliates	0.0			0.0			0.0	0.0
Interest expense	3.3			1.6			9.8	4.6
Income tax expense (benefit)	(1.9)			(1.0)			9.4	8.2
Net income (loss)	(6.1)			(2.7)			28.1	24.5
Net income (loss) attributed to common shareholders	(6.1)			(2.7)			28.1	24.5
Other States | Utility Operations | External Revenues
Segment information
Total operating revenues	69.2			52.8			410.0	358.2
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	63.7			42.3			148.4	126.2
Interest expense	4.9			4.8			14.6	14.5
Income tax expense (benefit)	14.3			9.7			32.5	28.9
Net income (loss)	44.5			27.8			101.3	82.8
Net income (loss) attributed to common shareholders	44.5			27.8			101.3	82.8
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	$ 139.9			129.5			$ 443.0	400.6
Other operation and maintenance	12.1			9.9			36.9	31.2
Depreciation and amortization	34.0			31.2			102.3	93.5
Equity in earnings of transmission affiliates	0.0			0.0			0.0	0.0
Interest expense	17.0			17.6			51.6	53.5
Income tax expense (benefit)	1.7			5.0			(10.5)	5.8
Net income (loss)	70.4			62.8			244.0	202.3
Net income (loss) attributed to common shareholders	71.0			64.4			242.8	204.6
Non-Utility Energy Infrastructure | External Revenues
Segment information
Total operating revenues	26.6			18.7			97.3	62.6
Non-Utility Energy Infrastructure | Intersegment Revenues
Segment information
Total operating revenues	$ 113.3			110.8			$ 345.7	338.0
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%
Non-Utility Energy Infrastructure | Thunderhead
Segment information
WEC's ownership interest	90.00%						90.00%
Corporate and Other
Segment information
Total operating revenues	$ 0.1			0.2			$ 0.4	0.4
Other operation and maintenance	(6.5)			(4.5)			(13.1)	(9.1)
Depreciation and amortization	6.2			6.3			19.5	19.3
Equity in earnings of transmission affiliates	0.0			0.0			0.0	0.0
Interest expense	30.9			24.7			78.1	73.5
Income tax expense (benefit)	(10.2)			(3.5)			(45.0)	(32.3)
Net income (loss)	(17.2)			(16.1)			(32.9)	(10.9)
Net income (loss) attributed to common shareholders	(17.2)			(16.1)			(32.9)	(10.9)
Corporate and Other | External Revenues
Segment information
Total operating revenues	0.1			0.2			0.4	0.4
Corporate and Other | Intersegment Revenues
Segment information
Total operating revenues	$ 0.0			$ 0.0			$ 0.0	$ 0.0

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