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PENSION PLANS AND POST-RETIREMENT BENEFITS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Pension Benefits      
Components of net periodic benefit costs      
Defined benefit plan, benefit obligation, beginning of the year $ 2,553.4 $ 1,367.0  
Service cost 79.1 60.7 $ 28.7
Interest cost 108.0 82.5 52.4
Contribution by participants 0.0 0.0  
Plan amendments   13.4  
Actuarial gain (loss) 262.4 (98.8)  
Benefits paid (180.5) (137.9)  
Settlements (96.6)    
Obligations assumed upon merger with Great Plains Energy   1,275.9  
Other (7.6) (9.4)  
Defined benefit plan, benefit obligation, end of the year 2,718.2 2,553.4 1,367.0
Change in plan assets      
Fair value of plan assets, beginning of the year 1,603.4 887.0  
Actual return on plan assets 284.0 (79.7)  
Contributions by employer and participants 125.2 114.5  
Benefits paid (175.6) (134.0)  
Settlements (96.6)    
Assets acquired upon merger with Great Plains Energy   825.0  
Other (7.6) (9.4)  
Fair value of plan assets, end of the year 1,732.8 1,603.4 887.0
Funded status at end of year (985.4) (950.0)  
Amounts recognized in the consolidated balance sheets      
Non-current asset 0.0 0.0  
Current pension and other post-retirement liability (5.6) (4.4)  
Noncurrent pension liability and other post-retirement liability (979.8) (945.6)  
Net amount recognized before regulatory treatment (985.4) (950.0)  
Accumulated OCI or regulatory asset/liability 454.1 419.9  
Net amount recognized at December 31, 2019 (531.3) (530.1)  
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:      
Accumulated OCI or regulatory asset/liability 454.1 419.9  
Pension Benefits | Evergy Kansas Central      
Components of net periodic benefit costs      
Defined benefit plan, benefit obligation, beginning of the year 1,258.9 1,367.0  
Service cost 29.0 32.2 28.7
Interest cost 53.7 50.7 52.4
Contribution by participants 0.0 0.0  
Plan amendments   11.4  
Actuarial gain (loss) 120.3 (100.1)  
Benefits paid (136.9) (97.9)  
Settlements 0.0    
Obligations assumed upon merger with Great Plains Energy   0.0  
Other (1.6) (4.4)  
Defined benefit plan, benefit obligation, end of the year 1,323.4 1,258.9 1,367.0
Change in plan assets      
Fair value of plan assets, beginning of the year 804.6 887.0  
Actual return on plan assets 130.5 (30.9)  
Contributions by employer and participants 43.0 47.9  
Benefits paid (134.4) (95.0)  
Settlements 0.0    
Assets acquired upon merger with Great Plains Energy   0.0  
Other (1.6) (4.4)  
Fair value of plan assets, end of the year 842.1 804.6 887.0
Funded status at end of year (481.3) (454.3)  
Amounts recognized in the consolidated balance sheets      
Non-current asset 0.0 0.0  
Current pension and other post-retirement liability (3.0) (2.6)  
Noncurrent pension liability and other post-retirement liability (478.3) (451.7)  
Net amount recognized before regulatory treatment (481.3) (454.3)  
Accumulated OCI or regulatory asset/liability 354.9 337.5  
Net amount recognized at December 31, 2019 (126.4) (116.8)  
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:      
Accumulated OCI or regulatory asset/liability 354.9 337.5  
Pension Benefits | Evergy Metro      
Components of net periodic benefit costs      
Defined benefit plan, benefit obligation, beginning of the year 1,272.4 1,331.7  
Service cost 50.1 48.6 44.2
Interest cost 53.3 49.9 52.6
Contribution by participants 0.0 0.0  
Plan amendments   2.0  
Actuarial gain (loss) 140.5 (89.6)  
Benefits paid (42.3) (70.2)  
Settlements (96.6)    
Obligations assumed upon merger with Great Plains Energy   0.0  
Other (6.0) 0.0  
Defined benefit plan, benefit obligation, end of the year 1,371.4 1,272.4 1,331.7
Change in plan assets      
Fair value of plan assets, beginning of the year 798.8 848.4  
Actual return on plan assets 153.5 (60.1)  
Contributions by employer and participants 82.2 80.3  
Benefits paid (41.2) (69.8)  
Settlements (96.6)    
Assets acquired upon merger with Great Plains Energy   0.0  
Other (6.0) 0.0  
Fair value of plan assets, end of the year 890.7 798.8 848.4
Funded status at end of year (480.7) (473.6)  
Amounts recognized in the consolidated balance sheets      
Non-current asset 0.0 0.0  
Current pension and other post-retirement liability (1.3) (0.5)  
Noncurrent pension liability and other post-retirement liability (479.4) (473.1)  
Net amount recognized before regulatory treatment (480.7) (473.6)  
Accumulated OCI or regulatory asset/liability 192.3 230.1  
Net amount recognized at December 31, 2019 (288.4) (243.5)  
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:      
Accumulated OCI or regulatory asset/liability 192.3 230.1  
Post-Retirement Benefits      
Components of net periodic benefit costs      
Defined benefit plan, benefit obligation, beginning of the year 249.3 138.6  
Service cost 2.5 2.3 1.2
Interest cost 10.5 8.0 5.5
Contribution by participants 8.8 5.6  
Plan amendments   0.0  
Actuarial gain (loss) 20.9 (11.3)  
Benefits paid (27.7) (17.3)  
Settlements 0.0    
Obligations assumed upon merger with Great Plains Energy   123.4  
Other 0.0 0.0  
Defined benefit plan, benefit obligation, end of the year 264.3 249.3 138.6
Change in plan assets      
Fair value of plan assets, beginning of the year 223.3 124.1  
Actual return on plan assets 30.0 (7.5)  
Contributions by employer and participants 13.2 11.6  
Benefits paid (26.6) (16.7)  
Settlements 0.0    
Assets acquired upon merger with Great Plains Energy   111.8  
Other 0.0 0.0  
Fair value of plan assets, end of the year 239.9 223.3 124.1
Funded status at end of year (24.4) (26.0)  
Amounts recognized in the consolidated balance sheets      
Non-current asset 15.0 17.5  
Current pension and other post-retirement liability (1.9) (1.7)  
Noncurrent pension liability and other post-retirement liability (37.5) (41.8)  
Net amount recognized before regulatory treatment (24.4) (26.0)  
Accumulated OCI or regulatory asset/liability (4.4) (6.0)  
Net amount recognized at December 31, 2019 (28.8) (32.0)  
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:      
Accumulated OCI or regulatory asset/liability (4.4) (6.0)  
Post-Retirement Benefits | Evergy Kansas Central      
Components of net periodic benefit costs      
Defined benefit plan, benefit obligation, beginning of the year 133.6 138.6  
Service cost 1.1 1.3 1.2
Interest cost 5.6 5.0 5.5
Contribution by participants 1.9 1.8  
Plan amendments   0.0  
Actuarial gain (loss) 9.5 (2.6)  
Benefits paid (13.0) (10.5)  
Settlements 0.0    
Obligations assumed upon merger with Great Plains Energy   0.0  
Other 0.0 0.0  
Defined benefit plan, benefit obligation, end of the year 138.7 133.6 138.6
Change in plan assets      
Fair value of plan assets, beginning of the year 109.7 124.1  
Actual return on plan assets 20.0 (7.4)  
Contributions by employer and participants 3.5 3.2  
Benefits paid (12.7) (10.2)  
Settlements 0.0    
Assets acquired upon merger with Great Plains Energy   0.0  
Other 0.0 0.0  
Fair value of plan assets, end of the year 120.5 109.7 124.1
Funded status at end of year (18.2) (23.9)  
Amounts recognized in the consolidated balance sheets      
Non-current asset 0.0 0.0  
Current pension and other post-retirement liability (1.0) (0.9)  
Noncurrent pension liability and other post-retirement liability (17.2) (23.0)  
Net amount recognized before regulatory treatment (18.2) (23.9)  
Accumulated OCI or regulatory asset/liability (2.9) 0.8  
Net amount recognized at December 31, 2019 (21.1) (23.1)  
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:      
Accumulated OCI or regulatory asset/liability (2.9) 0.8  
Post-Retirement Benefits | Evergy Metro      
Components of net periodic benefit costs      
Defined benefit plan, benefit obligation, beginning of the year 115.7 133.2  
Service cost 1.4 2.0 2.1
Interest cost 4.9 4.8 5.4
Contribution by participants 6.9 6.6  
Plan amendments   0.0  
Actuarial gain (loss) 11.4 (18.0)  
Benefits paid (14.7) (12.9)  
Settlements 0.0    
Obligations assumed upon merger with Great Plains Energy   0.0  
Other 0.0 0.0  
Defined benefit plan, benefit obligation, end of the year 125.6 115.7 133.2
Change in plan assets      
Fair value of plan assets, beginning of the year 113.6 115.8  
Actual return on plan assets 10.0 (1.2)  
Contributions by employer and participants 9.7 11.4  
Benefits paid (13.9) (12.4)  
Settlements 0.0    
Assets acquired upon merger with Great Plains Energy   0.0  
Other 0.0 0.0  
Fair value of plan assets, end of the year 119.4 113.6 $ 115.8
Funded status at end of year (6.2) (2.1)  
Amounts recognized in the consolidated balance sheets      
Non-current asset 15.0 17.5  
Current pension and other post-retirement liability (0.9) (0.8)  
Noncurrent pension liability and other post-retirement liability (20.3) (18.8)  
Net amount recognized before regulatory treatment (6.2) (2.1)  
Accumulated OCI or regulatory asset/liability (13.0) (19.1)  
Net amount recognized at December 31, 2019 (19.2) (21.2)  
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:      
Accumulated OCI or regulatory asset/liability (13.0) (19.1)  
Actuarial (gain) loss | Pension Benefits      
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:      
Actuarial (gain) loss 439.7 403.6  
Actuarial (gain) loss | Pension Benefits | Evergy Kansas Central      
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:      
Actuarial (gain) loss 342.3 323.2  
Actuarial (gain) loss | Pension Benefits | Evergy Metro      
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:      
Actuarial (gain) loss 189.4 226.3  
Actuarial (gain) loss | Post-Retirement Benefits      
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:      
Actuarial (gain) loss (5.7) (7.8)  
Actuarial (gain) loss | Post-Retirement Benefits | Evergy Kansas Central      
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:      
Actuarial (gain) loss (4.2) (1.0)  
Actuarial (gain) loss | Post-Retirement Benefits | Evergy Metro      
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:      
Actuarial (gain) loss (4.9) (11.0)  
Prior service cost | Pension Benefits      
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:      
Prior service cost 14.4 16.3  
Prior service cost | Pension Benefits | Evergy Kansas Central      
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:      
Prior service cost 12.6 14.3  
Prior service cost | Pension Benefits | Evergy Metro      
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:      
Prior service cost 2.9 3.8  
Prior service cost | Post-Retirement Benefits      
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:      
Prior service cost 1.3 1.8  
Prior service cost | Post-Retirement Benefits | Evergy Kansas Central      
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:      
Prior service cost 1.3 1.8  
Prior service cost | Post-Retirement Benefits | Evergy Metro      
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:      
Prior service cost $ (8.1) $ (8.1)