Acquisitions - Thunderhead (Details) $ in Millions	1 Months Ended
	Sep. 30, 2022 USD ($) MW	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Asset Acquisition - Allocation of Purchase Price to Assets acquired, Liabilities assumed, less Noncontrolling Interest
Net property, plant, and equipment		$ 31,581.5	$ 29,113.8
Other long-term assets		383.1	427.3
Other current liabilities		(5,114.8)	(4,611.0)
Other long-term liabilities		$ (26,753.4)	$ (25,644.5)
Thunderhead | WECI
Asset Acquisition
Ownership interest in generating facility acquired	90.00%
Capacity of generation unit | MW	300
Total purchase price	$ 382.0
Duration of offtake agreement for the sale of energy produced	12 years
Asset Acquisition - Allocation of Purchase Price to Assets acquired, Liabilities assumed, less Noncontrolling Interest
Accounts receivable	$ 0.2
Other prepayments	0.3
Net property, plant, and equipment	692.3
Other long-term assets	5.1
Other current liabilities	(0.2)
Other long-term liabilities	(273.2)
Noncontrolling interest	(42.5)
Total purchase price	$ 382.0