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Schedule I - Statements of Cash Flows (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating activities                      
Net income attributed to common shareholders $ 432.6 $ 215.4 $ 199.1 $ 356.6 $ 194.4 $ 217.0 $ 181.4 $ 346.2 $ 1,203.7 $ 939.0 $ 638.5
Reconciliation to cash provided by operating activities                      
Equity income in subsidiaries, net of distributions                 (4.8) (46.6) (11.0)
Deferred income taxes                 274.4 498.7 420.4
Change in -                      
Other current assets                 (6.0) 103.1 (27.2)
Other current liabilities                 161.8 (20.8) 14.1
Other, net                 (197.5) (53.8) (209.1)
Investing activities                      
Bluewater acquisition                 0.0 0.0 (1,329.9)
Purchase of subsidiary's common stock                 (109.6) (42.3) (8.7)
Proceeds from the sale of assets and businesses                 24.0 166.3 28.9
Other, net                 12.0 3.0 57.0
Financing activities                      
Exercise of stock options                 30.8 41.6 30.1
Purchase of common stock                 (71.3) (108.0) (74.7)
Dividends paid on common stock                 (656.5) (624.9) (455.4)
Issuance of long-term debt                 435.0 400.0 2,150.0
Other, net                 (6.5) (13.6) (18.9)
Net change in cash and cash equivalents                 1.4 (12.3) (12.1)
Cash and cash equivalents at beginning of year       37.5       49.8 37.5 49.8 61.9
Cash and cash equivalents at end of year 38.9       37.5       38.9 37.5 49.8
WEC Energy Group                      
Operating activities                      
Net income attributed to common shareholders                 1,203.7 939.0 638.5
Reconciliation to cash provided by operating activities                      
Equity income in subsidiaries, net of distributions                 (686.1) (262.1) (156.9)
Deferred income taxes                 89.5 23.2 30.9
Change in -                      
Prepaid taxes                 28.4 (47.6) 0.0
Other current assets                 (0.1) 13.0 (9.3)
Accrued taxes                 0.0 (75.6) 175.7
Other current liabilities                 (1.9) (5.6) (3.2)
Other, net                 0.9 6.3 (18.4)
Net cash provided by operating activities                 634.4 590.6 657.3
Investing activities                      
Integrys acquisition                 0.0 0.0 (1,486.2)
Bluewater acquisition                 (226.0) 0.0 0.0
Capital contributions to subsidiaries                 (173.4) (55.8) (135.3)
Short-term notes receivable from related parties, net                 167.8 46.8 (91.0)
Issuance of long-term note receivable to UMERC                 (50.0) 0.0 0.0
Purchase of subsidiary's common stock                 0.0 (66.4) 0.0
Proceeds from the sale of assets and businesses                 0.0 0.0 20.8
Other, net                 4.5 (0.4) (0.1)
Net cash used in investing activities                 (277.1) (75.8) (1,691.8)
Financing activities                      
Exercise of stock options                 30.8 41.6 30.1
Purchase of common stock                 (71.3) (108.0) (74.7)
Dividends paid on common stock                 (656.5) (624.9) (455.4)
Issuance of long-term debt                 0.0 0.0 1,200.0
Change in short-term debt                 173.0 13.9 307.9
Short-term notes payable to related parties, net                 169.5 162.3 1.8
Other, net                 0.0 0.2 (11.2)
Net cash (used in) provided by financing activities                 (354.5) (514.9) 998.5
Net change in cash and cash equivalents                 2.8 (0.1) (36.0)
Cash and cash equivalents at beginning of year       $ 1.2       $ 1.3 1.2 1.3 37.3
Cash and cash equivalents at end of year $ 4.0       $ 1.2       $ 4.0 $ 1.2 $ 1.3