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Benefit Plans and Other Postretirement Benefits, Fair value measurements of plan assets (Details) - Pension Benefits - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | $ 632.3 | $ 581.0 | $ 514.1
U.S. equities - large cap |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 124.9 | 112.0 |
U.S. equities - small/mid cap and other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 37.7 | 36.4 |
International equities - growth |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 67.5 | 56.9 |
International equities - other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 96.2 | 74.9 |
Alternative investment funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 22.4 | 21.1 |
U.S. fixed income securities - short term |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets |  | 18.1 |
U.S. fixed income securities - intermediate term |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 29.2 | 26.8 |
Fixed Income Securities - Long Term [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 130.5 | 118.6 |
U.S. fixed income securities - high yield |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 15.5 | 14.2 |
International fixed income securities - other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 49.5 | 24.0 |
Insurance contracts |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 40.0 | 37.0 |
Real estate funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 10.8 | 10.7 |
Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 8.1 | 30.3 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 162.4 | 165.8 |
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 | 63.5 | 56.9 |
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 | 61.6 | 51.8 |
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 - short term |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets |  | 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 | 29.2 | 26.8 |
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 | 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 | 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 | 8.1 | 30.3 |
Significant Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 341.8 | 312.5 |
Significant Observable Inputs (Level 2) | U.S. equities - large cap |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 61.4 | 55.1 |
Significant Observable Inputs (Level 2) | U.S. equities - small/mid cap and other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 37.7 | 36.4 |
Significant Observable Inputs (Level 2) | International equities - growth |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 5.9 | 5.1 |
Significant Observable Inputs (Level 2) | International equities - other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 41.3 | 41.0 |
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 - short term |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets |  | 18.1 |
Significant Observable Inputs (Level 2) | U.S. fixed income securities - intermediate term |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Significant Observable Inputs (Level 2) | Fixed Income Securities - Long Term [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 130.5 | 118.6 |
Significant Observable Inputs (Level 2) | U.S. fixed income securities - high yield |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 15.5 | 14.2 |
Significant Observable Inputs (Level 2) | International fixed income securities - other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 49.5 | 24.0 |
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 | 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 | 50.8 | 47.7 | $ 45.3
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 - short term |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets |  | 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 | 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 | 40.0 | 37.0 |
Significant Unobservable Inputs (Level 3) | Real estate funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 10.8 | 10.7 |
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 | 77.3 | 55.0 |
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 | 54.9 | 33.9 |
Fair Value Measured At Net Asset Value | Alternative investment funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 22.4 | 21.1 |
Fair Value Measured At Net Asset Value | U.S. fixed income securities - short term |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets |  | 0.0 |
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 | 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 | 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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