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Schedule I - Cash Dividends Received from Subsidiaries (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accounting Standards Update 2016-15 | Impact of ASU |  |  |
Notes to parent company financial statements |  |  |
Return of capital from subsidiaries |  |  | $ 9.0
WEC Energy Group |  |  |
Notes to parent company financial statements |  |  |
Cash dividends received from subsidiaries | $ 688.9 | $ 548.6 | 725.4
Return of capital from subsidiaries | 290.2 | 0.0 | 9.0
WEC Energy Group | WE |  |  |
Notes to parent company financial statements |  |  |
Cash dividends received from subsidiaries | 310.0 | 240.0 | 455.0
WEC Energy Group | We Power |  |  |
Notes to parent company financial statements |  |  |
Cash dividends received from subsidiaries | 223.0 | 181.0 | 188.9
WEC Energy Group | ATC Holding LLC |  |  |
Notes to parent company financial statements |  |  |
Cash dividends received from subsidiaries | 105.8 | 82.6 | 6.5
WEC Energy Group | WG |  |  |
Notes to parent company financial statements |  |  |
Cash dividends received from subsidiaries | 50.0 | 45.0 | 75.0
WEC Energy Group | Wisvest |  |  |
Notes to parent company financial statements |  |  |
Cash dividends received from subsidiaries | $ 0.1 | $ 0.0 | $ 0.0

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