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Schedule I - Cash Dividends Received from Subsidiaries (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
ATC Holding LLC |  |  |
Notes to parent company financial statements |  |  |
Return of capital from subsidiaries | $ 19.6 | $ 220.6 | $ 290.2
WECI |  |  |
Notes to parent company financial statements |  |  |
Return of capital from subsidiaries | 583.2 | 116.7 |
WEC Energy Group |  |  |
Notes to parent company financial statements |  |  |
Cash dividends received from subsidiaries | 898.1 | 735.3 | 688.9
Return of capital from subsidiaries | 602.8 | 337.3 | 290.2
WEC Energy Group | WE |  |  |
Notes to parent company financial statements |  |  |
Cash dividends received from subsidiaries | 395.0 | 360.0 | 310.0
WEC Energy Group | We Power |  |  |
Notes to parent company financial statements |  |  |
Cash dividends received from subsidiaries | 240.9 | 192.5 | 223.0
WEC Energy Group | ATC Holding LLC |  |  |
Notes to parent company financial statements |  |  |
Cash dividends received from subsidiaries | 112.6 | 87.4 | 105.8
WEC Energy Group | WG |  |  |
Notes to parent company financial statements |  |  |
Cash dividends received from subsidiaries | 70.0 | 60.0 | 50.0
WEC Energy Group | UMERC |  |  |
Notes to parent company financial statements |  |  |
Cash dividends received from subsidiaries | 46.0 | 10.0 | 0.0
WEC Energy Group | WECI |  |  |
Notes to parent company financial statements |  |  |
Cash dividends received from subsidiaries | 33.6 | 25.4 | 0.0
WEC Energy Group | Wisvest |  |  |
Notes to parent company financial statements |  |  |
Cash dividends received from subsidiaries | $ 0.0 | $ 0.0 | $ 0.1

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