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INVESTMENT IN TRANSMISSION AFFILIATES - RELATED PARTY TRANSACTIONS BALANCE SHEET INFORMATION (Details) $ in Millions	Mar. 31, 2020 USD ($) solar_projects	Dec. 31, 2019 USD ($)
WPS
Investment in transmission affiliates
Number of new solar projects | solar_projects	2
ATC
Investment in transmission affiliates
Accounts receivable for services provided to ATC	$ 2.6	$ 3.5
Accounts payable for services received from ATC	29.3	29.0
Amounts due from ATC for transmission infrastructure upgrades	$ 2.3	$ 2.8

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