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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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