Regulatory Environment - WI Solar Generation Projects (Details) - Public Service Commission of Wisconsin (PSCW) $ in Millions	Aug. 01, 2019 USD ($) MW	May 31, 2018 USD ($) solar_projects MW
WE | Badger Hollow Solar Farm II
Public Utilities, General Disclosures [Line Items]
Solar project output that approval was requested for from the PSCW (in megawatts)	100
Estimated share of cost for solar project(s) | $	$ 130
WE | Two Creeks Solar Farm [Member]
Public Utilities, General Disclosures [Line Items]
Solar project output that approval was requested for from the PSCW (in megawatts)	100
WPS | Badger Hollow Solar Farm I
Public Utilities, General Disclosures [Line Items]
Solar project output that approval was requested for from the PSCW (in megawatts)		100
WPS | Badger Hollow Solar Farm 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 output that approval was requested for from the PSCW (in megawatts)		200
Estimated share of cost for solar project(s) | $		$ 256