Regulatory Environment - WI Solar Generation Projects (Details) - Public Service Commission of Wisconsin (PSCW) $ in Millions	Mar. 31, 2020 USD ($) MW	Apr. 30, 2019 USD ($) solar_projects MW
WE | Badger Hollow II
Public Utilities, General Disclosures [Line Items]
Solar project megawatts that approval was requested for from the PSCW	100
Estimated share of cost for solar project(s) | $	$ 130
WPS | Two Creeks
Public Utilities, General Disclosures [Line Items]
Solar project megawatts that approval was requested for from the PSCW		100
WPS | Badger Hollow I
Public Utilities, General Disclosures [Line Items]
Solar project megawatts that approval was requested for from the PSCW		100
WPS | Badger Hollow Solar Park I and Two Creeks Solar Project
Public Utilities, General Disclosures [Line Items]
Number of solar projects for which approval was requested | solar_projects		2
Solar project megawatts that approval was requested for from the PSCW		200
Estimated share of cost for solar project(s) | $		$ 260