Acquisitions - Delilah (Details) $ in Millions	1 Months Ended
	Dec. 31, 2024 USD ($) MW	Dec. 03, 2024 USD ($)	Dec. 31, 2023 USD ($)
Asset Acquisition - Allocation of Purchase Price to Assets acquired, Liabilities assumed, less Noncontrolling Interest
Other current assets	$ 121.9		$ 223.7
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)
Delilah I | WECI
Asset Acquisition
Ownership interest in generating facility acquired	90.00%
Capacity of generation unit | MW	300
Total purchase price	$ 462.5
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
Other current assets		$ 0.1
Property, plant, and equipment, net of accumulated depreciation and amortization of $11,611.9 and $11,073.1, respectively		579.8
Other long-term assets		12.4
Other long-term liabilities		$ (78.3)
Noncontrolling interest	$ (51.5)
Total purchase price	$ 462.5