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SEGMENT INFORMATION (Details) $ in Millions	3 Months Ended					6 Months Ended
	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Jun. 30, 2025 USD ($) numberOfSegments	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Segment information
Number of reportable segments | numberOfSegments						6
Operating revenues	$ 2,009.5			$ 1,772.0		$ 5,159.0	$ 4,452.2
Fuel and purchased power costs	391.8			332.3		782.1	681.5
Cost of natural gas sold	178.7			137.4		954.1	715.3
Other operation and maintenance	596.2			533.4		1,204.2	1,064.2
Depreciation and amortization	368.9			336.6		728.8	670.0
Property and revenue taxes	69.0			67.5		147.4	143.0
Equity in earnings of transmission affiliates	51.9			46.8		105.5	91.6
Other income, net	26.5			40.6		44.6	84.7
Interest expense	220.8			200.6		443.8	392.6
Income tax expense (benefit)	19.5			41.6		80.2	129.3
Preferred stock dividends of subsidiary	0.3			0.3		0.6	0.6
Net loss attributed to noncontrolling interests	2.7	$ (1.0)	$ 1.6	1.6		1.7	1.6
Net income (loss) attributed to common shareholders	245.4	724.2		211.3	$ 622.3	969.6	833.6
Capital expenditures and asset acquisitions	829.4			792.1		1,936.6	1,236.6
Equity method investments	2,284.6			2,138.1		2,284.6	2,138.1
Total assets	48,524.3		47,363.2	44,582.2		48,524.3	44,582.2
External revenues
Segment information
Operating revenues	2,009.5			1,772.0		5,159.0	4,452.2
Intersegment revenues
Segment information
Operating revenues	0.0			0.0		0.0	0.0
Utility operations
Segment information
Fuel and purchased power costs	391.8			332.3		782.1	681.5
Cost of natural gas sold	187.9			147.3		972.2	734.6
Other operation and maintenance	552.3			516.4		1,143.0	1,033.9
Depreciation and amortization	327.3			303.5		647.5	603.0
Property and revenue taxes	64.1			62.8		137.0	134.4
Equity in earnings of transmission affiliates	0.0			0.0		0.0	0.0
Other income, net	22.2			34.7		42.0	70.0
Interest expense	184.7			184.8		374.0	371.6
Income tax expense (benefit)	45.4			44.9		211.4	204.9
Preferred stock dividends of subsidiary	0.3			0.3		0.6	0.6
Net loss attributed to noncontrolling interests	0.0		0.0			0.0	0.0
Net income (loss) attributed to common shareholders	208.5			158.4		789.6	650.9
Capital expenditures and asset acquisitions	808.3			779.6		1,496.8	1,204.2
Equity method investments	16.8			15.0		16.8	15.0
Total assets	40,929.2			38,522.4		40,929.2	38,522.4
Utility operations | External revenues
Segment information
Operating revenues	1,940.1			1,716.0		5,015.4	4,345.4
Utility operations | Intersegment revenues
Segment information
Operating revenues	0.0			0.0		0.0	0.0
Reconciling eliminations
Segment information
Fuel and purchased power costs	0.0			0.0		0.0	0.0
Cost of natural gas sold	(10.5)			(10.8)		(23.9)	(25.0)
Other operation and maintenance	(3.9)			(4.0)		(5.5)	(5.5)
Depreciation and amortization	(24.8)			(21.9)		(48.7)	(42.7)
Property and revenue taxes	0.0			0.0		0.0	0.0
Equity in earnings of transmission affiliates	0.0			0.0		0.0	0.0
Other income, net	(8.0)			(6.8)		(15.4)	(13.5)
Interest expense	(88.8)			(89.7)		(177.4)	(180.0)
Income tax expense (benefit)	0.0			0.0		0.0	0.0
Preferred stock dividends of subsidiary	0.0			0.0		0.0	0.0
Net loss attributed to noncontrolling interests	0.0		0.0			0.0	0.0
Net income (loss) attributed to common shareholders	0.0			0.0		0.0	0.0
Capital expenditures and asset acquisitions	0.0			0.0		0.0	0.0
Equity method investments	0.0			0.0		0.0	0.0
Total assets	(3,652.8)			(3,548.1)		(3,652.8)	(3,548.1)
Reconciling eliminations | WE
Segment information
Total assets	2,629.4			2,702.9		2,629.4	2,702.9
Reconciling eliminations | External revenues
Segment information
Operating revenues	0.0			0.0		0.0	0.0
Reconciling eliminations | Intersegment revenues
Segment information
Operating revenues	$ (120.0)			(119.6)		$ (240.1)	(239.7)
ATC
Segment information
Ownership interest (as a percent)	60.00%					60.00%
Equity in earnings of transmission affiliates	$ 50.3			46.2		$ 100.3	90.6
Equity method investments	$ 2,177.5	2,121.6	2,085.1	2,029.7	2,001.6	$ 2,177.5	2,029.7	$ 1,980.8
ATC Holdco
Segment information
Ownership interest (as a percent)	75.00%					75.00%
Equity in earnings of transmission affiliates	$ 1.6			0.6		$ 5.2	1.0
Equity method investments	22.6	$ 27.4	23.8	26.1	$ 25.5	22.6	26.1	$ 25.1
Wisconsin | Operating Segments
Segment information
Operating revenues	1,587.2			1,368.2		3,647.1	3,147.0
Wisconsin | Operating Segments | Utility operations
Segment information
Fuel and purchased power costs	391.8			332.3		782.1	681.5
Cost of natural gas sold	128.4			81.7		506.9	383.5
Other operation and maintenance	416.0			389.2		831.1	779.1
Depreciation and amortization	250.2			228.3		493.8	452.9
Property and revenue taxes	44.5			44.9		90.5	92.2
Equity in earnings of transmission affiliates	0.0			0.0		0.0	0.0
Other income, net	19.8			32.3		37.4	65.7
Interest expense	157.9			157.3		319.7	315.1
Income tax expense (benefit)	35.5			34.4		117.5	109.3
Preferred stock dividends of subsidiary	0.3			0.3		0.6	0.6
Net loss attributed to noncontrolling interests	0.0		0.0			0.0	0.0
Net income (loss) attributed to common shareholders	182.4			132.1		542.3	398.5
Capital expenditures and asset acquisitions	699.5			654.2		1,316.4	985.0
Equity method investments	16.8			15.0		16.8	15.0
Total assets	31,314.9			29,154.2		31,314.9	29,154.2
Wisconsin | Operating Segments | Utility operations | External revenues
Segment information
Operating revenues	1,587.2			1,368.2		3,647.1	3,147.0
Wisconsin | Operating Segments | Utility operations | Intersegment revenues
Segment information
Operating revenues	0.0			0.0		0.0	0.0
Illinois | Operating Segments
Segment information
Operating revenues	270.6			276.8		1,058.9	942.8
Illinois | Operating Segments | Utility operations
Segment information
Fuel and purchased power costs	0.0			0.0		0.0	0.0
Cost of natural gas sold	29.5			41.8		317.7	236.5
Other operation and maintenance	112.4			102.6		259.3	209.6
Depreciation and amortization	64.8			63.7		129.2	127.2
Property and revenue taxes	12.8			11.6		33.2	29.7
Equity in earnings of transmission affiliates	0.0			0.0		0.0	0.0
Other income, net	2.3			2.3		4.4	4.2
Interest expense	22.1			23.5		45.3	48.5
Income tax expense (benefit)	8.7			10.2		77.9	82.3
Preferred stock dividends of subsidiary	0.0			0.0		0.0	0.0
Net loss attributed to noncontrolling interests	0.0		0.0			0.0	0.0
Net income (loss) attributed to common shareholders	22.6			25.7		200.7	213.2
Capital expenditures and asset acquisitions	71.6			93.9		125.4	169.6
Equity method investments	0.0			0.0		0.0	0.0
Total assets	7,989.9			7,844.7		7,989.9	7,844.7
Illinois | Operating Segments | Utility operations | External revenues
Segment information
Operating revenues	270.6			276.8		1,058.9	942.8
Illinois | Operating Segments | Utility operations | Intersegment revenues
Segment information
Operating revenues	0.0			0.0		0.0	0.0
Other States | Operating Segments
Segment information
Operating revenues	82.3			71.0		309.4	255.6
Other States | Operating Segments | Utility operations
Segment information
Fuel and purchased power costs	0.0			0.0		0.0	0.0
Cost of natural gas sold	30.0			23.8		147.6	114.6
Other operation and maintenance	23.9			24.6		52.6	45.2
Depreciation and amortization	12.3			11.5		24.5	22.9
Property and revenue taxes	6.8			6.3		13.3	12.5
Equity in earnings of transmission affiliates	0.0			0.0		0.0	0.0
Other income, net	0.1			0.1		0.2	0.1
Interest expense	4.7			4.0		9.0	8.0
Income tax expense (benefit)	1.2			0.3		16.0	13.3
Preferred stock dividends of subsidiary	0.0			0.0		0.0	0.0
Net loss attributed to noncontrolling interests	0.0		0.0			0.0	0.0
Net income (loss) attributed to common shareholders	3.5			0.6		46.6	39.2
Capital expenditures and asset acquisitions	37.2			31.5		55.0	49.6
Equity method investments	0.0			0.0		0.0	0.0
Total assets	1,624.4			1,523.5		1,624.4	1,523.5
Other States | Operating Segments | Utility operations | External revenues
Segment information
Operating revenues	82.3			71.0		309.4	255.6
Other States | Operating Segments | Utility operations | Intersegment revenues
Segment information
Operating revenues	0.0			0.0		0.0	0.0
Electric Transmission | Operating Segments
Segment information
Fuel and purchased power costs	0.0			0.0		0.0	0.0
Cost of natural gas sold	0.0			0.0		0.0	0.0
Other operation and maintenance	0.0			0.0		0.0	0.0
Depreciation and amortization	0.0			0.0		0.0	0.0
Property and revenue taxes	0.0			0.0		0.0	0.0
Equity in earnings of transmission affiliates	51.9			46.8		105.5	91.6
Other income, net	0.0			0.0		0.0	0.0
Interest expense	4.9			4.9		9.7	9.7
Income tax expense (benefit)	11.4			10.5		23.3	20.4
Preferred stock dividends of subsidiary	0.0			0.0		0.0	0.0
Net loss attributed to noncontrolling interests	0.0		0.0			0.0	0.0
Net income (loss) attributed to common shareholders	35.6			31.4		72.5	61.5
Capital expenditures and asset acquisitions	0.0			0.0		0.0	0.0
Equity method investments	2,200.1			2,055.8		2,200.1	2,055.8
Total assets	2,201.0			2,057.7		2,201.0	2,057.7
Electric Transmission | Operating Segments | External revenues
Segment information
Operating revenues	0.0			0.0		0.0	0.0
Electric Transmission | Operating Segments | Intersegment revenues
Segment information
Operating revenues	$ 0.0			0.0		$ 0.0	0.0
Electric Transmission | ATC
Segment information
Ownership interest (as a percent)	60.00%					60.00%
Electric Transmission | ATC Holdco
Segment information
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%
Non-Utility Energy Infrastructure | Operating Segments
Segment information
Operating revenues	$ 189.4			175.6		$ 383.7	346.5
Fuel and purchased power costs	0.0			0.0		0.0	0.0
Cost of natural gas sold	1.3			0.9		5.8	5.7
Other operation and maintenance	50.9			25.0		73.0	43.2
Depreciation and amortization	60.8			49.6		119.0	98.7
Property and revenue taxes	4.9			4.7		10.3	8.5
Equity in earnings of transmission affiliates	0.0			0.0		0.0	0.0
Other income, net	0.7			0.2		1.4	0.2
Interest expense	31.5			24.1		62.1	48.2
Income tax expense (benefit)	(38.9)			(20.2)		(74.5)	(43.6)
Preferred stock dividends of subsidiary	0.0			0.0		0.0	0.0
Net loss attributed to noncontrolling interests	2.7		1.6			1.7	1.6
Net income (loss) attributed to common shareholders	82.3			93.3		191.1	187.6
Capital expenditures and asset acquisitions	17.5			7.4		432.1	24.7
Equity method investments	0.0			0.0		0.0	0.0
Total assets	7,812.7			6,302.9		7,812.7	6,302.9
Non-Utility Energy Infrastructure | Operating Segments | External revenues
Segment information
Operating revenues	69.4			56.0		143.6	106.8
Non-Utility Energy Infrastructure | Operating Segments | Intersegment revenues
Segment information
Operating revenues	120.0			119.6		240.1	239.7
Corporate and Other | Operating Segments
Segment information
Operating revenues	0.0			0.0		0.0	0.0
Fuel and purchased power costs	0.0			0.0		0.0	0.0
Cost of natural gas sold	0.0			0.0		0.0	0.0
Other operation and maintenance	(3.1)			(4.0)		(6.3)	(7.4)
Depreciation and amortization	5.6			5.4		11.0	11.0
Property and revenue taxes	0.0			0.0		0.1	0.1
Equity in earnings of transmission affiliates	0.0			0.0		0.0	0.0
Other income, net	11.6			12.5		16.6	28.0
Interest expense	88.5			76.5		175.4	143.1
Income tax expense (benefit)	1.6			6.4		(80.0)	(52.4)
Preferred stock dividends of subsidiary	0.0			0.0		0.0	0.0
Net loss attributed to noncontrolling interests	0.0		$ 0.0			0.0	0.0
Net income (loss) attributed to common shareholders	(81.0)			(71.8)		(83.6)	(66.4)
Capital expenditures and asset acquisitions	3.6			5.1		7.7	7.7
Equity method investments	67.7			67.3		67.7	67.3
Total assets	1,234.2			1,247.3		1,234.2	1,247.3
Corporate and Other | Operating Segments | External revenues
Segment information
Operating revenues	0.0			0.0		0.0	0.0
Corporate and Other | Operating Segments | Intersegment revenues
Segment information
Operating revenues	$ 0.0			$ 0.0		$ 0.0	$ 0.0

X

- Definition

Amount of asset recognized for present right to economic benefit.

+ References

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