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Schedule I - Statements of Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statements of comprehensive income                      
Net income attributed to common shareholders $ 243.9 $ 234.3 $ 235.7 $ 420.1 $ 205.0 $ 233.2 $ 231.0 $ 390.1 $ 1,134.0 $ 1,059.3 $ 1,203.7
Other comprehensive loss, net of tax                 (1.5) (5.5) 0.0
Comprehensive income attributed to common shareholders                 1,132.5 1,053.8 1,203.7
Derivatives accounted for as cash flow hedges                      
Other comprehensive income (loss), net of tax                      
Cumulative effect adjustment from adoption of ASU 2018-02 0.0       1.6       0.0 1.6 0.0
Derivatives accounted for as cash flow hedges                      
Net derivative losses, net of tax benefits of $1.3, $0.8, and $0.0, respectively                 (3.5) (2.1) 0.0
Reclassification of net gains to net income, net of tax                 (0.8) (1.2) (1.3)
Cash flow hedges, net                 (4.3) (1.7) (1.3)
Defined benefit plans                      
Other comprehensive income (loss), net of tax                      
Cumulative effect adjustment from adoption of ASU 2018-02 0.0       (1.0)       0.0 (1.0) 0.0
Defined benefit plans                      
Pension and OPEB adjustments arising during the period, net of tax                 2.6 (3.1) 0.9
Amortization of pension and OPEB costs included in net periodic benefit cost, net of tax                 0.2 0.3 0.4
Defined benefit plans, net                 (2.8) 3.8 (1.3)
WEC Energy Group                      
Statements of comprehensive income                      
Net income attributed to common shareholders                 1,134.0 1,059.3 1,203.7
Other comprehensive income (loss) from subsidiaries, net of tax                 2.2 (2.8) 1.2
Other comprehensive loss, net of tax                 (1.5) (5.5) 0.0
Comprehensive income attributed to common shareholders                 1,132.5 1,053.8 1,203.7
WEC Energy Group | Derivatives accounted for as cash flow hedges                      
Other comprehensive income (loss), net of tax                      
Cumulative effect adjustment from adoption of ASU 2018-02 0.0       1.6       0.0 1.6 0.0
Derivatives accounted for as cash flow hedges                      
Net derivative losses, net of tax benefits of $1.3, $0.8, and $0.0, respectively                 (3.5) (2.1) 0.0
Reclassification of net gains to net income, net of tax                 (0.8) (1.2) (1.3)
Cash flow hedges, net                 (4.3) (1.7) (1.3)
WEC Energy Group | Defined benefit plans                      
Other comprehensive income (loss), net of tax                      
Cumulative effect adjustment from adoption of ASU 2018-02 $ 0.0       $ (0.3)       0.0 (0.3) 0.0
Defined benefit plans                      
Pension and OPEB adjustments arising during the period, net of tax                 0.4 (0.9) (0.1)
Amortization of pension and OPEB costs included in net periodic benefit cost, net of tax                 0.2 0.2 0.2
Defined benefit plans, net                 $ 0.6 $ (1.0) $ 0.1