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TAXES - Deferred Income Taxes (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Tax credit carryforward $ 379.6 $ 548.9
Income taxes refundable to customers, net 418.2 466.3
Deferred employee benefit costs 227.6 197.0
Net operating loss carryforward 51.0 163.4
Deferred state income taxes 145.9 64.4
Alternative minimum tax carryforward 0.0 37.9
Accrued liabilities 152.7 80.4
Other 181.0 183.2
Total deferred tax assets before valuation allowance 1,556.0 1,741.5
Valuation allowances (14.4) (17.5)
Total deferred tax assets, net 1,541.6 1,724.0
Deferred tax liabilities:    
Plant-related (2,693.7) (3,004.8)
Deferred employee benefit costs (171.4) (173.3)
ARO regulatory assets (136.7) (102.3)
Acquisition premium (46.9) (68.2)
Other (157.7) (119.8)
Total deferred tax liabilities (3,206.4) (3,468.4)
Net deferred income tax liabilities (1,664.8) (1,744.4)
Evergy Kansas Central    
Deferred tax assets:    
Tax credit carryforward 176.5 337.3
Income taxes refundable to customers, net 237.5 234.3
Deferred employee benefit costs 105.4 93.4
Net operating loss carryforward 0.0 23.1
Deferred state income taxes 101.7 64.4
Alternative minimum tax carryforward 0.0 13.4
Accrued liabilities 61.8 14.5
Other 91.4 99.1
Total deferred tax assets before valuation allowance 774.3 879.5
Valuation allowances 0.0 0.0
Total deferred tax assets, net 774.3 879.5
Deferred tax liabilities:    
Plant-related (1,341.2) (1,428.3)
Deferred employee benefit costs (75.6) (93.4)
ARO regulatory assets (49.9) (53.4)
Acquisition premium (46.9) (68.2)
Other (85.2) (53.9)
Total deferred tax liabilities (1,598.8) (1,697.2)
Net deferred income tax liabilities (824.5) (817.7)
Evergy Metro    
Deferred tax assets:    
Tax credit carryforward 195.9 204.4
Income taxes refundable to customers, net 132.8 176.2
Deferred employee benefit costs 117.9 120.4
Net operating loss carryforward 0.2 61.9
Deferred state income taxes 37.8 0.0
Alternative minimum tax carryforward 0.0 0.0
Accrued liabilities 61.0 29.1
Other 44.8 55.1
Total deferred tax assets before valuation allowance 590.4 647.1
Valuation allowances 0.0 0.0
Total deferred tax assets, net 590.4 647.1
Deferred tax liabilities:    
Plant-related (972.1) (1,143.2)
Deferred employee benefit costs (76.3) (79.5)
ARO regulatory assets (54.3) (13.8)
Acquisition premium 0.0 0.0
Other (46.5) (53.4)
Total deferred tax liabilities (1,149.2) (1,289.9)
Net deferred income tax liabilities $ (558.8) $ (642.8)