XML 141 R109.htm IDEA: XBRL DOCUMENT
v3.20.4

LONG-TERM DEBT (Details) - USD ($) $ in Millions | Dec. 31, 2020 | May 31, 2020 | Apr. 30, 2020 | Dec. 31, 2019
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Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Current Maturities | $ (436.4) |  |  | $ (251.1)
Unamortized debt discount and debt issuance costs | (84.9) |  |  | (80.7)
Total excluding current maturities | 9,190.9 |  |  | 8,746.7
Fair Value adjustment |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 110.4 |  |  | 125.5
Long-term Debt, Current Maturities | $ (4.4) |  |  | $ (4.3)
Mortgage Bonds | Mortgage Bonds Due 2020 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  |  |  | 5.10%
Long-term debt gross |  |  |  | $ 250.0
Mortgage Bonds | Mortgage Bonds Due 2025 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 3.25% |  |  | 3.25%
Long-term debt gross | $ 250.0 |  |  | $ 250.0
Mortgage Bonds | Mortgage Bonds Due 2026 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 2.55% |  |  | 2.55%
Long-term debt gross | $ 350.0 |  |  | $ 350.0
Mortgage Bonds | Mortgage Bonds Due 2027 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 3.10% |  |  | 3.10%
Long-term debt gross | $ 300.0 |  |  | $ 300.0
Mortgage Bonds | Mortgage Bonds Due 2042 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 4.125% |  |  | 4.125%
Long-term debt gross | $ 550.0 |  |  | $ 550.0
Mortgage Bonds | Mortgage Bonds Due 2043 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 4.10% |  |  | 4.10%
Long-term debt gross | $ 430.0 |  |  | $ 430.0
Mortgage Bonds | Mortgage Bonds Due 2043 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 4.625% |  |  | 4.625%
Long-term debt gross | $ 250.0 |  |  | $ 250.0
Mortgage Bonds | Mortgage Bonds Due 2045 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 4.25% |  |  | 4.25%
Long-term debt gross | $ 300.0 |  |  | $ 300.0
Mortgage Bonds | Mortgage Bonds Due 2049 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 3.25% |  |  | 3.25%
Long-term debt gross | $ 300.0 |  |  | $ 300.0
Mortgage Bonds | Mortgage Bonds Due 2050 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 3.45% |  |  |
Long-term debt gross | $ 500.0 |  |  |
Mortgage Bonds | Mortgage Bonds Due 2023 EKS |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 6.15% |  |  | 6.15%
Long-term debt gross | $ 50.0 |  |  | $ 50.0
Mortgage Bonds | Mortgage Bonds Due 2037 EKS |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 6.53% |  |  | 6.53%
Long-term debt gross | $ 175.0 |  |  | $ 175.0
Mortgage Bonds | Mortgage Bonds Due 2038 EKS |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 6.64% |  |  | 6.64%
Long-term debt gross | $ 100.0 |  |  | $ 100.0
Mortgage Bonds | Mortgage Bonds Due 2044 EKS |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 4.30% |  |  | 4.30%
Long-term debt gross | $ 250.0 |  |  | $ 250.0
Mortgage Bonds | Mortgage Bonds Due 2023 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 2.95% |  |  | 2.95%
Long-term debt gross | $ 79.5 |  |  | $ 79.5
Mortgage Bonds | Mortgage Bonds Due 2030 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 2.25% |  |  |
Long-term debt gross | $ 400.0 |  |  |
Mortgage Bonds | Mortgage Bonds Due 2049 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 4.125% |  |  | 4.125%
Long-term debt gross | $ 400.0 |  |  | $ 400.0
Mortgage Bonds | Mortgage Bonds Due Through 2021-2021 EMW |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 9.44% |  |  | 9.44%
Long-term debt gross | $ 1.1 |  |  | $ 2.3
Pollution Control Bonds | Pollution Control Bonds Due 2032A EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 0.18% |  |  | 1.39%
Long-term debt gross | $ 45.0 |  |  | $ 45.0
Pollution Control Bonds | Pollution Control Bonds Due 2032B EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 0.18% |  |  | 1.39%
Long-term debt gross | $ 30.5 |  |  | $ 30.5
Pollution Control Bonds | Pollution Control Bonds Due 2027 EKS |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 0.18% |  |  | 1.39%
Long-term debt gross | $ 21.9 |  |  | $ 21.9
Pollution Control Bonds | Pollution Control Bonds Due 2031 EKS |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 2.50% |  |  | 2.50%
Long-term debt gross | $ 50.0 |  |  | $ 50.0
Pollution Control Bonds | Pollution Control Bonds Due 2032A EKS |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 0.18% |  |  | 1.39%
Long-term debt gross | $ 14.5 |  |  | $ 14.5
Pollution Control Bonds | Pollution Control Bonds Due 2032B EKS |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 1.39% |  |  | 1.39%
Long-term debt gross | $ 10.0 |  |  | $ 10.0
Pollution Control Bonds | EIRR Bonds Series 2007A and 2007B due 2035 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 1.432% |  |  | 1.432%
Long-term debt gross | $ 146.5 |  |  | $ 146.5
Pollution Control Bonds | EIRR Bonds Series 2007A and 2007B due 2038 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 2.75% |  |  | 2.75%
Long-term debt gross | $ 23.4 |  |  | $ 23.4
Senior Notes | Series Notes Due 2023 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 3.15% |  |  | 3.15%
Long-term debt gross | $ 300.0 |  |  | $ 300.0
Senior Notes | Senior Notes Due 2025 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 3.65% |  |  | 3.65%
Long-term debt gross | $ 350.0 |  |  | $ 350.0
Senior Notes | Senior Notes Due 2035 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 6.05% |  |  | 6.05%
Long-term debt gross | $ 250.0 |  |  | $ 250.0
Senior Notes | Senior Notes Due 2035A EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 5.78% |  |  | 5.78%
Senior Notes | Senior Notes Due 2041 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 5.30% |  |  | 5.30%
Long-term debt gross | $ 400.0 |  |  | $ 400.0
Senior Notes | Senior Notes Due 2047 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 4.20% |  |  | 4.20%
Long-term debt gross | $ 300.0 |  |  | $ 300.0
Senior Notes | Senior Notes Due 2048 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 4.20% |  |  | 4.20%
Long-term debt gross | $ 300.0 |  |  | $ 300.0
Senior Notes | Senior Notes Due 2021 EMW |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 8.27% |  |  | 8.27%
Long-term debt gross | $ 80.9 |  |  | $ 80.9
Senior Notes | Senior Notes Due 2025 EMW |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 3.49% |  |  | 3.49%
Long-term debt gross | $ 36.0 |  |  | $ 36.0
Senior Notes | Senior Notes Due 2033 EMW |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 4.06% |  |  | 4.06%
Long-term debt gross | $ 60.0 |  |  | $ 60.0
Senior Notes | Senior Notes Due 2043 EMW |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 4.74% |  |  | 4.74%
Long-term debt gross | $ 150.0 |  |  | $ 150.0
Senior Notes | Senior Notes Series Due 2022 EMW |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 3.74% |  |  | 3.74%
Long-term debt gross | $ 100.0 |  |  | $ 100.0
Senior Notes | Senior Notes Due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 4.85% |  |  | 4.85%
Long-term debt gross | $ 350.0 |  |  | $ 350.0
Senior Notes | Senior Notes Due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 5.292% |  |  | 5.292%
Long-term debt gross | $ 287.5 |  |  | $ 287.5
Senior Notes | Senior Notes Due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 2.45% |  |  | 2.45%
Long-term debt gross | $ 800.0 |  |  | $ 800.0
Senior Notes | Senior Notes Due 2029 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 2.90% |  |  | 2.90%
Long-term debt gross | $ 800.0 |  |  | $ 800.0
Senior Notes | Senior Notes Due 2029A |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 3.77% |  |  | 3.77%
Medium Term Notes | Medium Term Notes Due 2023 EMW |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 7.33% |  |  | 7.33%
Long-term debt gross | $ 3.0 |  |  | $ 3.0
Medium Term Notes | Medium Term Notes Due 2023 EMW |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 7.17% |  |  | 7.17%
Long-term debt gross | $ 7.0 |  |  | $ 7.0
Evergy Kansas Central |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Current Maturities | 0.0 |  |  | (250.0)
Unamortized debt discount and debt issuance costs | (45.4) |  |  | (40.8)
Total excluding current maturities | 3,931.5 |  |  | 3,436.1
Evergy Kansas Central | Fair Value adjustment |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2020 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  |  | 5.10% |
Long-term debt gross |  |  | $ 250.0 | 250.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2025 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 250.0 |  |  | 250.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2026 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 350.0 |  |  | 350.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2027 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 300.0 |  |  | 300.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2042 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 550.0 |  |  | 550.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2043 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 430.0 |  |  | 430.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2043 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 250.0 |  |  | 250.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2045 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 300.0 |  |  | 300.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2049 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 300.0 |  |  | 300.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2050 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  |  | 3.45% |
Long-term debt gross | 500.0 |  | $ 500.0 |
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2023 EKS |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 50.0 |  |  | 50.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2037 EKS |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 175.0 |  |  | 175.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2038 EKS |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 100.0 |  |  | 100.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2044 EKS |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 250.0 |  |  | 250.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2023 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2030 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  |
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2049 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due Through 2021-2021 EMW |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Kansas Central | Pollution Control Bonds | Pollution Control Bonds Due 2032A EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 45.0 |  |  | 45.0
Evergy Kansas Central | Pollution Control Bonds | Pollution Control Bonds Due 2032B EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 30.5 |  |  | 30.5
Evergy Kansas Central | Pollution Control Bonds | Pollution Control Bonds Due 2027 EKS |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 21.9 |  |  | 21.9
Evergy Kansas Central | Pollution Control Bonds | Pollution Control Bonds Due 2031 EKS |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 50.0 |  |  | 50.0
Evergy Kansas Central | Pollution Control Bonds | Pollution Control Bonds Due 2032A EKS |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 14.5 |  |  | 14.5
Evergy Kansas Central | Pollution Control Bonds | Pollution Control Bonds Due 2032B EKS |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 10.0 |  |  | 10.0
Evergy Kansas Central | Pollution Control Bonds | EIRR Bonds Series 2007A and 2007B due 2035 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Kansas Central | Pollution Control Bonds | EIRR Bonds Series 2007A and 2007B due 2038 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Kansas Central | Senior Notes | Series Notes Due 2023 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Kansas Central | Senior Notes | Senior Notes Due 2025 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Kansas Central | Senior Notes | Senior Notes Due 2035 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Kansas Central | Senior Notes | Senior Notes Due 2041 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Kansas Central | Senior Notes | Senior Notes Due 2047 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Kansas Central | Senior Notes | Senior Notes Due 2048 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Kansas Central | Senior Notes | Senior Notes Due 2021 EMW |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Kansas Central | Senior Notes | Senior Notes Due 2025 EMW |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Kansas Central | Senior Notes | Senior Notes Due 2033 EMW |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Kansas Central | Senior Notes | Senior Notes Due 2043 EMW |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Kansas Central | Senior Notes | Senior Notes Series Due 2022 EMW |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Kansas Central | Senior Notes | Senior Notes Due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Kansas Central | Senior Notes | Senior Notes Due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Kansas Central | Senior Notes | Senior Notes Due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 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
Evergy Kansas Central | Medium Term Notes | Medium Term Notes Due 2023 EMW |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Kansas Central | Medium Term Notes | Medium Term Notes Due 2023 EMW |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Current Maturities | 0.0 |  |  | 0.0
Unamortized debt discount and debt issuance costs | (26.4) |  |  | (24.4)
Total excluding current maturities | 2,923.0 |  |  | 2,525.0
Evergy Metro | Fair Value adjustment |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2020 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross |  |  |  | 0.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2025 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2026 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2027 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2042 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2043 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2043 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2045 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2049 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross |  |  |  |
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2050 EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  |
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2023 EKS |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2037 EKS |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2038 EKS |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2044 EKS |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2023 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 79.5 |  |  | 79.5
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2030 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 2.25% |  |
Long-term debt gross | 400.0 | $ 400.0 |  |
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2049 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 400.0 |  |  | 400.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due Through 2021-2021 EMW |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro | Mortgage Bonds | General Mortgage Bonds EIRR Series 2005 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 50.0 |  |  | 21.9
Evergy Metro | Pollution Control Bonds | Pollution Control Bonds Due 2032A EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro | Pollution Control Bonds | Pollution Control Bonds Due 2032B EKC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro | Pollution Control Bonds | Pollution Control Bonds Due 2027 EKS |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro | Pollution Control Bonds | Pollution Control Bonds Due 2031 EKS |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro | Pollution Control Bonds | Pollution Control Bonds Due 2032A EKS |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro | Pollution Control Bonds | Pollution Control Bonds Due 2032B EKS |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro | Pollution Control Bonds | EIRR Bonds Series 2007A and 2007B due 2035 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 146.5 |  |  | 146.5
Evergy Metro | Pollution Control Bonds | EIRR Bonds Series 2007A and 2007B due 2038 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 23.4 |  |  | 23.4
Evergy Metro | Senior Notes | Series Notes Due 2023 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 300.0 |  |  | 300.0
Evergy Metro | Senior Notes | Senior Notes Due 2025 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 350.0 |  |  | 350.0
Evergy Metro | Senior Notes | Senior Notes Due 2035 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 250.0 |  |  | 250.0
Evergy Metro | Senior Notes | Senior Notes Due 2041 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 400.0 |  |  | 400.0
Evergy Metro | Senior Notes | Senior Notes Due 2047 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 300.0 |  |  | 300.0
Evergy Metro | Senior Notes | Senior Notes Due 2048 EM |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 300.0 |  |  | 300.0
Evergy Metro | Senior Notes | Senior Notes Due 2021 EMW |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro | Senior Notes | Senior Notes Due 2025 EMW |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro | Senior Notes | Senior Notes Due 2033 EMW |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro | Senior Notes | Senior Notes Due 2043 EMW |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro | Senior Notes | Senior Notes Series Due 2022 EMW |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro | Senior Notes | Senior Notes Due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro | Senior Notes | Senior Notes Due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro | Senior Notes | Senior Notes Due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro | Senior Notes | Senior Notes Due 2029 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro | Medium Term Notes | Medium Term Notes Due 2023 EMW |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Evergy Metro | Medium Term Notes | Medium Term Notes Due 2023 EMW |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 0.0 |  |  | 0.0
Variable Interest Entities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Current Maturities | (18.8) |  |  | (32.3)
Total excluding current maturities | 0.0 |  |  | 18.8
Variable Interest Entities | Unsecured Debt | Unsecured Debt Due 2021 VIEs |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | 18.8 |  |  | 51.1
Long-term Debt, Current Maturities | (18.8) |  |  | (32.3)
Total excluding current maturities | 0.0 |  |  | 18.8
Variable Interest Entities | Evergy Kansas Central |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Current Maturities | (18.8) |  |  | (32.3)
Total excluding current maturities | $ 0.0 |  |  | $ 18.8

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