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Benefit Plans and Other Postretirement Benefits, Fair value measurements of plan assets (Details) - Pension Benefits - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | $ 644.0 | $ 632.3 | $ 581.0
U.S. equities - large cap |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 62.7 | 124.9 |
U.S. equities - small/mid cap and other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 15.9 | 37.7 |
International equities - growth |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 31.8 | 67.5 |
International equities - other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 70.9 | 96.2 |
Alternative investment funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 25.5 | 22.4 |
U.S. fixed income securities - intermediate term |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 97.3 | 29.2 |
Fixed Income Securities - Long Term [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 266.1 | 130.5 |
U.S. fixed income securities - high yield |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets |  | 15.5 |
International fixed income securities - other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 30.2 | 49.5 |
Insurance contracts |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 34.1 | 40.0 |
Real estate funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets |  | 10.8 |
Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 9.5 | 8.1 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 65.1 | 162.4 |
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 | 30.1 | 63.5 |
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 | 25.5 | 61.6 |
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 | 29.2 |
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) | U.S. fixed income securities - high yield |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets |  | 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) | Real estate funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets |  | 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 | 9.5 | 8.1 |
Significant Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 494.1 | 341.8 |
Significant Observable Inputs (Level 2) | U.S. equities - large cap |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 32.6 | 61.4 |
Significant Observable Inputs (Level 2) | U.S. equities - small/mid cap and other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 15.9 | 37.7 |
Significant Observable Inputs (Level 2) | International equities - growth |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 6.3 | 5.9 |
Significant Observable Inputs (Level 2) | International equities - other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 45.7 | 41.3 |
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 | 97.3 | 0.0 |
Significant Observable Inputs (Level 2) | Fixed Income Securities - Long Term [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 266.1 | 130.5 |
Significant Observable Inputs (Level 2) | U.S. fixed income securities - high yield |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets |  | 15.5 |
Significant Observable Inputs (Level 2) | International fixed income securities - other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 30.2 | 49.5 |
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) | Real estate funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets |  | 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 | 34.1 | 50.8 | $ 47.7
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) | U.S. fixed income securities - high yield |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets |  | 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 | 34.1 | 40.0 |
Significant Unobservable Inputs (Level 3) | Real estate funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets |  | 10.8 |
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 | 50.7 | 77.3 |
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 | 25.2 | 54.9 |
Fair Value Measured At Net Asset Value | Alternative investment funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 25.5 | 22.4 |
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 | U.S. fixed income securities - high yield |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets |  | 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 | Real estate funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets |  | 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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