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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Short-term Debt [Line Items] |  |  |  |  |
Issuance of short-term loan |  |  | $ 0.9 | $ 340.0 | $ 0.0
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 |  |  | $ 736.1 | 820.4 |
Issuance of short-term loan |  |  | $ 0.0 | 340.0 | $ 0.0
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% |  |  |  |
Commercial paper |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Commercial paper outstanding |  |  | $ 1,896.1 | $ 1,436.9 |
Average interest rate on amount outstanding |  |  | 0.26% | 0.21% |
Average amount outstanding during the year |  |  | $ 1,480.0 |  |
Weighted- average interest rate during the year |  |  | 0.18% |  |
Term loan |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Average interest rate on amount outstanding |  |  |  | 0.99% |
Term loan outstanding |  |  | $ 0.0 | $ 340.0 |
Issuance of short-term loan |  | $ 340.0 |  |  |
Length of term loan |  | 364 days |  |  |
Term loan | WEC Energy Group |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Length of term loan | 364 days |  |  |  |
Operating expense loans |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Term loan outstanding |  |  | $ 0.9 | $ 0.0 |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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