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Benefit Plans and Other Postretirement Benefits, Fair value measurements of plan assets (Details) - Pension Benefits - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | $ 444.5 | $ 481.6 | $ 470.6
U.S. equities - large cap |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 26.8 | 29.0 |
U.S. equities - small/mid cap and other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 7.2 | 8.7 |
International equities - growth |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 10.3 | 22.1 |
International equities - other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 40.9 | 25.7 |
Alternative investment funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 1.1 | 5.6 |
U.S. fixed income securities - intermediate term |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 131.1 | 113.5 |
Fixed Income Securities - Long Term [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 170.6 | 210.9 |
International fixed income securities - other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 36.0 | 39.7 |
Insurance contracts |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 17.8 | 19.5 |
Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 2.7 | 6.9 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 13.0 | 19.2 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. equities - large cap |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. equities - small/mid cap and other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | International equities - growth |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 10.3 | 12.3 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | International equities - other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Alternative investment funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. fixed income securities - intermediate term |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed Income Securities - Long Term [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | International fixed income securities - other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Insurance contracts |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 2.7 | 6.9 |
Significant Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 412.6 | 437.3 |
Significant Observable Inputs (Level 2) | U.S. equities - large cap |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 26.8 | 29.0 |
Significant Observable Inputs (Level 2) | U.S. equities - small/mid cap and other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 7.2 | 8.7 |
Significant Observable Inputs (Level 2) | International equities - growth |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 9.8 |
Significant Observable Inputs (Level 2) | International equities - other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 40.9 | 25.7 |
Significant Observable Inputs (Level 2) | Alternative investment funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Significant Observable Inputs (Level 2) | U.S. fixed income securities - intermediate term |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 131.1 | 113.5 |
Significant Observable Inputs (Level 2) | Fixed Income Securities - Long Term [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 170.6 | 210.9 |
Significant Observable Inputs (Level 2) | International fixed income securities - other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 36.0 | 39.7 |
Significant Observable Inputs (Level 2) | Insurance contracts |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Significant Observable Inputs (Level 2) | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 17.8 | 19.5 | $ 24.3
Significant Unobservable Inputs (Level 3) | U.S. equities - large cap |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) | U.S. equities - small/mid cap and other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) | International equities - growth |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) | International equities - other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) | Alternative investment funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) | U.S. fixed income securities - intermediate term |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) | Fixed Income Securities - Long Term [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) | International fixed income securities - other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) | Insurance contracts |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 17.8 | 19.5 |
Significant Unobservable Inputs (Level 3) | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Fair Value Measured At Net Asset Value |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 1.1 | 5.6 |
Fair Value Measured At Net Asset Value | U.S. equities - large cap |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Fair Value Measured At Net Asset Value | U.S. equities - small/mid cap and other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Fair Value Measured At Net Asset Value | International equities - growth |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Fair Value Measured At Net Asset Value | International equities - other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Fair Value Measured At Net Asset Value | Alternative investment funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 1.1 | 5.6 |
Fair Value Measured At Net Asset Value | U.S. fixed income securities - intermediate term |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Fair Value Measured At Net Asset Value | Fixed Income Securities - Long Term [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Fair Value Measured At Net Asset Value | International fixed income securities - other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Fair Value Measured At Net Asset Value | Insurance contracts |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Fair Value Measured At Net Asset Value | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | $ 0.0 | $ 0.0 |

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