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Schedule I - Fair Value of Long-Term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Carrying amount |  |
Financial instruments |  |
Long-term debt | $ 9,285.8 | $ 9,221.9
Fair value |  |
Financial instruments |  |
Long-term debt | 9,818.2 | 9,681.0
WEC Energy Group | Carrying amount |  |
Financial instruments |  |
Long-term debt | 1,890.0 | 1,887.2
WEC Energy Group | Fair value |  |
Financial instruments |  |
Long-term debt | $ 1,906.1 | $ 1,900.7

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