Acquisitions - Blooming Grove (Details) $ in Millions	1 Months Ended
	Dec. 31, 2020 USD ($) MW	Dec. 31, 2021 USD ($)
Asset Acquisition - Allocation of Purchase Price to Assets acquired, Liabilities assumed, less Noncontrolling Interest
Net property, plant, and equipment	$ 25,707.4	$ 26,982.4
Other current liabilities	$ (704.7)	$ (680.9)
Blooming Grove
Asset Acquisition
Capacity of generation unit | MW	250
Duration of offtake agreement for the sale of energy produced	12 years
Blooming Grove | WECI
Asset Acquisition
Ownership interest in generating facility acquired	90.00%
Total purchase price	$ 364.6
Cash and restricted cash acquired	24.1
Asset Acquisition - Allocation of Purchase Price to Assets acquired, Liabilities assumed, less Noncontrolling Interest
Net property, plant, and equipment	488.3
Accounts receivable	0.3
Other long-term assets	2.9
Accounts payable	(13.7)
Other current liabilities	(1.5)
Long-term liabilities	(68.7)
Noncontrolling interest	(43.0)
Total purchase price	$ 364.6