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Long-Term debt and Equity Financings (Details) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 4 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 USD ($) $ / shares shares | Mar. 31, 2023 USD ($) shares | Apr. 30, 2024 USD ($) | Jan. 31, 2024 USD ($)
Long-Term Debt And Equity Financings [Line Items] |  |  |  |
Shares issued under the DRPlus and 401(k) plan | shares | 0.1 | 0.1 |  |
Issuances of common stock | $ 10.0 | $ 5.0 |  |
Stock Issued During Period, Shares, Other | shares | 0.2 | 0.5 |  |
Stock Issued During Period, Value, Other | $ 16.0 |  |  |
Maximum Value Of Shares To Be Issued Under ATM Program | $ 770.0 |  |  |
Forward Contract Indexed to Issuer's Equity, Basis Spread | 75 |  |  |
Minimum |  |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |  |
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share | $ / shares | $ 76.69 |  |  |
Maximum |  |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |  |
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share | $ / shares | 89.31 |  |  |
Weighted Average |  |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |  |
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share | $ / shares | $ 80.45 |  |  |
Dividend reinvestment and 401 (k) plans |  |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |  |
Issuances of common stock | $ 3.0 |  |  |
Accrued Proceeds from Issuance of Common Stock | $ 7.0 |  |  |
Forward Sale Agreements Outstanding |  |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |  |
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Shares, at Fair Value | shares | 2.9 |  |  |
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value | $ 231.0 |  |  |
Period End Net Cash Settlement Price | 20.0 |  |  |
Period End Net Share Settlement Price | $ 0.3 |  |  |
Forward Sale Agreement Equity Offering Shares | shares | 2.9 |  |  |
Forward Sale Agreement Gross Sales Price | $ 232.0 |  |  |
Union Electric Company | Subsequent Event | Other Paid-in Capital: |  |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |  |
Capital contributions from parent |  |  | $ 350.0 |
Union Electric Company | Secured Debt | First Mortgage Bonds, 5.25%, Due 2054 - $350 Issuance |  |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 350.0
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 5.25%
Union Electric Company | Secured Debt | Senior Secured Notes 5.20% Due 2034 | Subsequent Event |  |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |  |
Debt Instrument, Face Amount |  |  | $ 500.0 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.20% |
Union Electric Company | Secured Debt | Senior Secured Notes350 Due2024 | Subsequent Event |  |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |  |
Debt Instrument, Face Amount |  |  | $ 350.0 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.50% |

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