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LONG-TERM DEBT - Narrative (Details)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2023
USD ($)
$ / shares
Dec. 31, 2023
USD ($)
$ / shares
Feb. 28, 2024
USD ($)
Nov. 30, 2023
USD ($)
May 31, 2023
USD ($)
Apr. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Debt Instrument [Line Items]                
Interest rate 5.06% 5.06%            
Convertible Notes Due 2027                
Debt Instrument [Line Items]                
Long-term debt gross $ 1,400.0 $ 1,400.0            
Interest rate 4.50% 4.50%            
Secured Debt | Mortgage Bonds Due 2053 EKC                
Debt Instrument [Line Items]                
Long-term debt gross $ 400.0 $ 400.0            
Interest rate 5.70% 5.70%            
Secured Debt | Mortgage Bonds Due 2033 EM                
Debt Instrument [Line Items]                
Long-term debt gross $ 300.0 $ 300.0            
Interest rate 4.95% 4.95%            
Secured Debt | Mortgage Bonds Due 2023 EKS                
Debt Instrument [Line Items]                
Long-term debt gross               $ 50.0
Interest rate               6.15%
Secured Debt | Mortgage Bonds Due 2033 EKC                
Debt Instrument [Line Items]                
Long-term debt gross $ 300.0 $ 300.0            
Interest rate 5.90% 5.90%            
Secured Debt | EIRR Bonds Due 2026 EM                
Debt Instrument [Line Items]                
Long-term debt gross $ 79.5 $ 79.5            
Interest rate 4.30% 4.30%            
Secured Debt | Mortgage Bonds Due 2023 EM                
Debt Instrument [Line Items]                
Long-term debt gross               $ 79.5
Interest rate               2.95%
Senior Notes                
Debt Instrument [Line Items]                
Debt Instrument, priority debt percentage of tangible net worth, maximum 15.00% 15.00%            
Senior Notes | Series Notes Due 2023 EM                
Debt Instrument [Line Items]                
Long-term debt gross               $ 300.0
Interest rate               3.15%
Senior Notes | Senior Notes Due 2024                
Debt Instrument [Line Items]                
Long-term debt gross $ 800.0 $ 800.0           $ 800.0
Interest rate 2.45% 2.45%           2.45%
Senior Notes | Senior Notes Due 2029                
Debt Instrument [Line Items]                
Long-term debt gross $ 800.0 $ 800.0           $ 800.0
Interest rate 2.90% 2.90%           2.90%
Term Loan Facility | Line Of Credit Facility Classified As Long Term Debt 2023                
Debt Instrument [Line Items]                
Long-term debt gross $ 500.0 $ 500.0           $ 500.0
Convertible Notes Payable | Convertible Notes Due 2027                
Debt Instrument [Line Items]                
Long-term debt gross $ 1,400.0 $ 1,400.0            
Interest rate 4.50% 4.50%            
Debt Instrument, Convertible, Threshold Trading Days 20              
Debt Instrument, Convertible, Threshold Consecutive Trading Days 30              
Debt Instrument, Convertible, Conversion Ratio 16.1809              
Debt Instrument, Convertible, Conversion Price | $ / shares $ 61.80 $ 61.80            
Debt Instrument, Redemption Price, Percentage   100.00%            
Convertible Notes Payable | Convertible Notes Due 2027 over-allotmnent                
Debt Instrument [Line Items]                
Long-term debt gross $ 200.0 $ 200.0            
Debt conversion terms one | Convertible Notes Payable | Convertible Notes Due 2027                
Debt Instrument [Line Items]                
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger 130.00%              
Debt conversion terms two | Convertible Notes Payable | Convertible Notes Due 2027                
Debt Instrument [Line Items]                
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger 98.00%              
Evergy Kansas Central                
Debt Instrument [Line Items]                
AdditionalPrincipalFirstMortgageBondsAvailableToBeIssued   518.6            
Evergy Kansas Central | Secured Debt | Mortgage Bonds Due 2053 EKC                
Debt Instrument [Line Items]                
Long-term debt gross $ 400.0 400.0         $ 400.0  
Interest rate             5.70%  
Evergy Kansas Central | Secured Debt | Mortgage Bonds Due 2033 EM                
Debt Instrument [Line Items]                
Long-term debt gross 0.0 0.0            
Evergy Kansas Central | Secured Debt | Mortgage Bonds Due 2023 EKS                
Debt Instrument [Line Items]                
Long-term debt gross         $ 50.0     50.0
Interest rate         6.15%      
Evergy Kansas Central | Secured Debt | Mortgage Bonds Due 2033 EKC                
Debt Instrument [Line Items]                
Long-term debt gross 300.0 300.0   $ 300.0        
Interest rate       5.90%        
Evergy Kansas Central | Secured Debt | EIRR Bonds Due 2026 EM                
Debt Instrument [Line Items]                
Long-term debt gross 0.0 0.0            
Evergy Kansas Central | Secured Debt | Mortgage Bonds Due 2023 EM                
Debt Instrument [Line Items]                
Long-term debt gross               0.0
Evergy Kansas Central | Senior Notes | Series Notes Due 2023 EM                
Debt Instrument [Line Items]                
Long-term debt gross               0.0
Evergy Kansas Central | Senior Notes | Senior Notes Due 2024                
Debt Instrument [Line Items]                
Long-term debt gross 0.0 0.0           0.0
Evergy Kansas Central | Senior Notes | Senior Notes Due 2029                
Debt Instrument [Line Items]                
Long-term debt gross 0.0 0.0           0.0
Evergy Kansas Central | Term Loan Facility | Line Of Credit Facility Classified As Long Term Debt 2023                
Debt Instrument [Line Items]                
Long-term debt gross               0.0
Evergy Kansas Central | Convertible Notes Payable | Convertible Notes Due 2027                
Debt Instrument [Line Items]                
Long-term debt gross $ 0.0 0.0            
Evergy Metro                
Debt Instrument [Line Items]                
AdditionalPrincipalFirstMortgageBondsAvailableToBeIssued   $ 5,548.5            
Percentage of Bondable Property Allowed 75.00% 75.00%            
Evergy Metro | Secured Debt | Mortgage Bonds Due 2053 EKC                
Debt Instrument [Line Items]                
Long-term debt gross $ 0.0 $ 0.0            
Evergy Metro | Secured Debt | Mortgage Bonds Due 2033 EM                
Debt Instrument [Line Items]                
Long-term debt gross 300.0 300.0       $ 300.0    
Interest rate           4.95%    
Evergy Metro | Secured Debt | Mortgage Bonds Due 2023 EKS                
Debt Instrument [Line Items]                
Long-term debt gross               0.0
Evergy Metro | Secured Debt | Mortgage Bonds Due 2033 EKC                
Debt Instrument [Line Items]                
Long-term debt gross 0.0 0.0            
Evergy Metro | Secured Debt | EIRR Bonds Due 2026 EM                
Debt Instrument [Line Items]                
Long-term debt gross $ 79.5 $ 79.5            
Interest rate 4.30% 4.30%            
Evergy Metro | Secured Debt | Mortgage Bonds Due 2023 EM                
Debt Instrument [Line Items]                
Long-term debt gross $ 79.5 $ 79.5           79.5
Interest rate 2.95% 2.95%            
Evergy Metro | Senior Notes | Series Notes Due 2023 EM                
Debt Instrument [Line Items]                
Long-term debt gross             $ 300.0 300.0
Interest rate             3.15%  
Evergy Metro | Senior Notes | Senior Notes Due 2024                
Debt Instrument [Line Items]                
Long-term debt gross $ 0.0 $ 0.0           0.0
Evergy Metro | Senior Notes | Senior Notes Due 2029                
Debt Instrument [Line Items]                
Long-term debt gross 0.0 0.0           0.0
Evergy Metro | Term Loan Facility | Line Of Credit Facility Classified As Long Term Debt 2023                
Debt Instrument [Line Items]                
Long-term debt gross               $ 0.0
Evergy Metro | Convertible Notes Payable | Convertible Notes Due 2027                
Debt Instrument [Line Items]                
Long-term debt gross $ 0.0 0.0            
Evergy Missouri West                
Debt Instrument [Line Items]                
AdditionalPrincipalFirstMortgageBondsAvailableToBeIssued   $ 2,158.7            
Evergy Missouri West | Senior Notes                
Debt Instrument [Line Items]                
Debt Instrument, debt to capitalization ratio (no more than) 65.00% 65.00%            
Evergy Missouri West | Subsequent Event | Securitized Bonds | SecuritizedBondsDue2040EMW [Member]                
Debt Instrument [Line Items]                
Long-term debt gross     $ 331.1          
Interest rate     5.10%          
Evergy Kansas South Inc                
Debt Instrument [Line Items]                
Maximum Amount Of First Mortgage Bonds Authorized $ 3,500.0 $ 3,500.0            
AdditionalPrincipalFirstMortgageBondsAvailableToBeIssued   $ 2,878.6