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Benefit Plans and Other Postretirement Benefits, Fair value measurements of plan assets (Details) - Pension Benefits - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | $ 581.0 | $ 514.1 | $ 497.9
U.S. equities - large cap |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 112.0 | 139.3 |
U.S. equities - small/mid cap and other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 36.4 | 27.5 |
International equities - growth |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 56.9 | 32.7 |
International equities - other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 74.9 | 84.9 |
Alternative investment funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 21.1 | 19.9 |
U.S. fixed income securities - short term |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 18.1 | 11.2 |
U.S. fixed income securities - intermediate term |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 26.8 | 77.7 |
Fixed Income Securities - Long Term [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 118.6 |  |
U.S. fixed income securities - high yield |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 14.2 | 26.4 |
International fixed income securities - other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 24.0 | 45.9 |
Insurance contracts |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 37.0 | 35.1 |
Real estate funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 10.7 | 10.2 |
Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 30.3 | 3.3 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 165.8 | 213.9 |
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 | 56.9 | 104.9 |
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 | 51.8 | 28.0 |
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 | 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 | 26.8 | 77.7 |
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 |  |
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 | 30.3 | 3.3 |
Significant Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 312.5 | 172.9 |
Significant Observable Inputs (Level 2) | U.S. equities - large cap |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 55.1 | 34.4 |
Significant Observable Inputs (Level 2) | U.S. equities - small/mid cap and other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 36.4 | 27.5 |
Significant Observable Inputs (Level 2) | International equities - growth |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 5.1 | 4.7 |
Significant Observable Inputs (Level 2) | International equities - other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 41.0 | 34.0 |
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 | 0.0 |
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 | 118.6 |  |
Significant Observable Inputs (Level 2) | U.S. fixed income securities - high yield |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 14.2 | 26.4 |
Significant Observable Inputs (Level 2) | International fixed income securities - other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 24.0 | 45.9 |
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 | 47.7 | 45.3 | $ 44.9
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 | 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 |  |
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 | 37.0 | 35.1 |
Significant Unobservable Inputs (Level 3) | Real estate funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 10.7 | 10.2 |
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 | 55.0 | 82.0 |
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 | 33.9 | 50.9 |
Fair Value Measured At Net Asset Value | Alternative investment funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 21.1 | 19.9 |
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 | 11.2 |
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 |  |
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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