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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Statement of Financial Position [Abstract]
Accounts receivable and unbilled revenues, reserves	$ 129.5	$ 162.8
Property, plant, and equipment, accumulated depreciation and amortization	$ 12,229.4	$ 11,611.9
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	650,000,000	650,000,000
Common stock, shares outstanding	325,294,252	317,680,855
Regulatory assets (September 30, 2025 and December 31, 2024 include $69.6 and $76.5, respectively, related to WEPCo Environmental Trust)	$ 3,217.4	$ 3,339.7
Current portion of long-term debt (September 30, 2025 and December 31, 2024 include $9.2 related to WEPCo Environmental Trust)	1,901.4	1,729.0
Long-term debt (September 30, 2025 and December 31, 2024 include $72.0 and $76.4, respectively, related to WEPCo Environmental Trust)	17,663.3	17,178.1
WEPCo Environmental Trust
Regulatory assets (September 30, 2025 and December 31, 2024 include $69.6 and $76.5, respectively, related to WEPCo Environmental Trust)	69.6	76.5
Current portion of long-term debt (September 30, 2025 and December 31, 2024 include $9.2 related to WEPCo Environmental Trust)	9.2	9.2
Long-term debt (September 30, 2025 and December 31, 2024 include $72.0 and $76.4, respectively, related to WEPCo Environmental Trust)	$ 72.0	$ 76.4

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