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Short-Term Debt and Lines of Credit - Outstanding Amounts (Details) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Short-term Debt [Line Items]
Issuance of short-term loan			$ 2.7	$ 0.9	$ 340.0
WE
Short-term Debt [Line Items]
Maximum debt to capitalization ratio			65.00%
WPS
Short-term Debt [Line Items]
Maximum debt to capitalization ratio			65.00%
WG
Short-term Debt [Line Items]
Maximum debt to capitalization ratio			65.00%
PGL
Short-term Debt [Line Items]
Maximum debt to capitalization ratio			65.00%
WEC Energy Group
Short-term Debt [Line Items]
Commercial paper outstanding			$ 399.7	736.1
Issuance of short-term loan			$ 0.0	0.0	$ 340.0
Maximum debt to capitalization ratio			70.00%
WEC Energy Group \| WEC Senior Notes 0.80% due 2024
Short-term Debt [Line Items]
Interest rate	0.80%
Issuance of debt	$ 600.0
Commercial paper
Short-term Debt [Line Items]
Commercial paper outstanding			$ 1,643.5	$ 1,896.1
Average interest rate on amount outstanding			4.64%	0.26%
Average amount outstanding during the year			$ 1,487.2
Weighted- average interest rate during the year			1.98%
Operating expense loans
Short-term Debt [Line Items]
Operating expense loan outstanding			$ 3.6	$ 0.9
Term loan
Short-term Debt [Line Items]
Issuance of short-term loan		$ 340.0
Length of term loan		364 days