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v3.25.1

Long-Term debt and Equity Financings (Details) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 USD ($) $ / shares shares | Mar. 31, 2024 USD ($) shares | Apr. 30, 2025 USD ($)
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 | $ 13.0 | $ 10.0 |
Stock Issued During Period, Shares, Other | shares | 0.3 | 0.2 |
Stock Issued During Period, Value, Other | $ 25.0 |  |
Maximum Value Of Shares To Be Issued Under ATM Program | $ 230.0 |  |
Forward Contract Indexed to Issuer's Equity, Basis Spread | 75 |  |
Dividend reinvestment and 401 (k) plans |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |
Issuances of common stock | $ 6.0 |  |
Accrued Proceeds from Issuance of Common Stock | 9.0 |  |
Senior unsecured Notes 5.375% Due 2035 | Unsecured Debt | Ameren (parent) |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |
Debt Instrument, Face Amount | $ 750.0 |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.375% |  |
First Mortgage Bonds, 5.25%, Due 2035 - $500 Issuance | Secured Debt | Union Electric Company | Subsequent Event |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |
Debt Instrument, Face Amount |  |  | $ 500.0
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.25%
First Mortgage Bonds, 5.625%, Due 2055 - $350 Issuance | Secured Debt | Ameren Illinois Company |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |
Debt Instrument, Face Amount | $ 350.0 |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.625% |  |
Senior Secured Notes, 3.25%, Due 2025 | Secured Debt | Ameren Illinois Company |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |
Debt Instrument, Face Amount | $ 300.0 |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.25% |  |
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 | 5.8 |  |
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value | $ 530.0 |  |
Period End Net Cash Settlement Price | 55.0 |  |
Period End Net Share Settlement Price | $ 0.6 |  |
Forward Sale Agreement Equity Offering Shares | shares | 5.8 |  |
Forward Sale Agreement Gross Sales Price | $ 535.0 |  |
Minimum |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share | $ / shares | $ 81.00 |  |
Maximum |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share | $ / shares | 98.66 |  |
Weighted Average |  |  |
Long-Term Debt And Equity Financings [Line Items] |  |  |
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share | $ / shares | $ 91.02 |  |

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