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Short-Term Debt and Lines of Credit - Outstanding Amounts (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Short-term Debt [Line Items] |  |
Commercial Paper | $ 860.2 | $ 1,095.0
WEC Energy Group |  |
Short-term Debt [Line Items] |  |
Commercial Paper | $ 321.8 | $ 307.9
Maximum Debt to Capitalization Ratio | 70.00% |
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% |
Commercial Paper |  |
Short-term Debt [Line Items] |  |
Commercial Paper | $ 860.2 |
Average interest rate on amount outstanding | 0.96% | 0.68%
Average amount outstanding during the year | $ 882.3 |
Weighted Average interest rate during the year | 0.66% |

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