XML 35 R35.htm IDEA: XBRL DOCUMENT

Rate Matters and Regulation (Details) $ in Millions	3 Months Ended
Rate Matters and Regulation (Details) $ in Millions	Mar. 31, 2020 USD ($)
Estimated Refund to SPP	$ 13.0
Public Utilities, Requested Rate Increase (Decrease), Amount	5.2
Investment in Grid Enhancement	800.0
Impact to Company [Member]
Estimated Refund to SPP	5.0
Customer Impact [Member]
Estimated Refund to SPP	$ 8.0