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Acquisitions - Forward Wind Energy Center (Details) - Forward Wind Energy Center
$ in Millions
1 Months Ended
Apr. 30, 2018
USD ($)
wind_turbines
utility
MW
Business Acquisition [Line Items]  
Number of wind turbines at Forward Wind Energy Center | wind_turbines 86
Capacity of generation unit | MW 138
Allocation of the purchase price  
Total 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
Ownership interest in wind generating facility acquired 44.60%
Transactions costs $ 1.9
Percentage of Forward Wind Energy Center's output purchased by WPS 44.60%
Allocation of the purchase price  
Current assets $ 0.2
Net property, plant, and equipment 76.9
Total purchase price $ 77.1