Acquisitions - Maple Flats (Details) $ in Millions	1 Months Ended
	Nov. 30, 2024 USD ($) MW	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Asset Acquisition - Allocation of Purchase Price to Assets acquired, Liabilities assumed, less Noncontrolling Interest
Property, plant, and equipment, net of accumulated depreciation and amortization of $11,611.9 and $11,073.1, respectively		$ 34,645.4	$ 31,581.5
Other long-term assets		336.2	383.1
Other long-term liabilities		$ (29,719.4)	$ (26,753.4)
Maple Flats | WECI
Asset Acquisition
Ownership interest in generating facility acquired	90.00%
Capacity of generation unit | MW	250
Total purchase price	$ 431.2
Duration of offtake agreement for the sale of energy produced	15 years
Asset Acquisition - Allocation of Purchase Price to Assets acquired, Liabilities assumed, less Noncontrolling Interest
Property, plant, and equipment, net of accumulated depreciation and amortization of $11,611.9 and $11,073.1, respectively	$ 469.5
Other long-term assets	44.5
Other long-term liabilities	(34.9)
Noncontrolling interest	(47.9)
Total purchase price	$ 431.2