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ACQUISITIONS - FORWARD ACQUISITION - CONSIDERATION TRANSFERRED (Details) - Forward Wind Energy Center Acquisition $ in Millions | 1 Months Ended |
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Apr. 30, 2018 USD ($) utility | Apr. 02, 2018 wind_turbines MW
Business Acquisition [Line Items] |  |
Number of utilities along with WPS that entered in an agreement to purchase Forward Wind Energy Center | utility | 2 |
Number of wind turbines at Forward Wind Energy Center | wind_turbines |  | 86
Capacity of Foward Wind Energy Center | MW |  | 129
Purchase price | $ | $ 172.9 |
WPS |  |
Business Acquisition [Line Items] |  |
Number of utilities along with WPS that entered in an agreement to purchase Forward Wind Energy Center | utility | 2 |
Purchase price | $ | $ 77.1 |
WPS's share of Forward Wind Energy Center's purchase price | 44.60% |
Percentage of Forward Wind Energy Center's output purchased by WPS |  | 44.60%

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