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Schedule I - Statements of Cash Flows (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating activities                      
Net income attributed to common shareholders $ 205.0 $ 233.2 $ 231.0 $ 390.1 $ 432.6 $ 215.4 $ 199.1 $ 356.6 $ 1,059.3 $ 1,203.7 $ 939.0
Reconciliation to cash provided by operating activities                      
Equity income in subsidiaries, net of distributions                 (18.6) (4.8) (46.6)
Deferred income taxes                 300.1 274.4 498.7
Change in -                      
Other current assets                 (10.0) (7.1) 103.2
Other current liabilities                 (67.6) 161.8 (20.8)
Other, net                 290.4 (197.4) (53.6)
Net cash provided by operating activities                   2,078.6 2,103.8
Investing activities                      
Acquisition of Bluewater                 0.0 (226.0) 0.0
Capital contributions to subsidiaries                 (53.5) (109.6) (42.3)
Other, net                 20.5 12.0 3.0
Net cash used in investing activities                   (2,254.1) (1,354.2)
Financing activities                      
Exercise of stock options                 29.1 30.8 41.6
Purchase of common stock                 (72.4) (71.3) (108.0)
Dividends paid on common stock                 (697.3) (656.5) (624.9)
Issuance of long-term debt                 1,740.0 435.0 400.0
Retirement of long-term debt                 (953.3) (154.5) (306.0)
Other, net                 (15.2) (6.5) (13.6)
Cash and cash equivalents at beginning of year       38.9       37.5 38.9 37.5  
Cash and cash equivalents at end of year 84.5       38.9       84.5 38.9 37.5
WEC Energy Group                      
Operating activities                      
Net income attributed to common shareholders                 1,059.3 1,203.7 939.0
Reconciliation to cash provided by operating activities                      
Equity income in subsidiaries, net of distributions                 (419.4) (686.1) (271.1)
Deferred income taxes                 14.4 89.5 23.2
Change in -                      
Prepaid taxes                 17.5 28.4 (47.6)
Other current assets                 (2.1) (0.1) 13.0
Accrued taxes                 3.6 0.0 (75.6)
Other current liabilities                 5.7 (1.9) (5.6)
Other, net                 5.6 0.9 6.3
Net cash provided by operating activities                 684.6 634.4 581.6
Investing activities                      
Acquisition of Bluewater                 0.0 (226.0) 0.0
Capital contributions to subsidiaries                 (448.7) (173.4) (55.8)
Return of capital from subsidiaries                 290.2 0.0 9.0
Short-term notes receivable from related parties, net                 (6.9) 167.8 46.8
Issuance of long-term notes receivable to UMERC                 (100.0) (50.0) 0.0
Purchase of subsidiary's common stock                 0.0 0.0 (66.4)
Other, net                 6.4 4.5 (0.4)
Net cash used in investing activities                 (259.0) (277.1) (66.8)
Financing activities                      
Exercise of stock options                 29.1 30.8 41.6
Purchase of common stock                 (72.4) (71.3) (108.0)
Dividends paid on common stock                 (697.3) (656.5) (624.9)
Issuance of long-term debt                 600.0 0.0 0.0
Retirement of long-term debt                 (300.0) 0.0 0.0
Change in short-term debt                 53.6 173.0 13.9
Short-term notes payable to related parties, net                 (6.2) 169.5 162.3
Other, net                 (3.6) 0.0 0.2
Net cash used in financing activities                 (396.8) (354.5) (514.9)
Net change in cash and cash equivalents                 28.8 2.8 (0.1)
Cash and cash equivalents at beginning of year       $ 4.0       $ 1.2 4.0 1.2 1.3
Cash and cash equivalents at end of year $ 32.8       $ 4.0       $ 32.8 $ 4.0 $ 1.2