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Benefit Plans and Other Postretirement Benefits, Fair Value Measurements (Details) - Pension Benefits - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | $ 439.9 | $ 392.2 | $ 409.4
U.S. equities — large cap |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 118.8 | 108.2 |
U.S. equities — small/mid cap and other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 25.8 | 22.7 |
International equities — growth |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 46.5 | 46.0 |
International equities — other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 60.6 | 52.3 |
Alternative investment funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 12.6 | 31.5 |
U.S. fixed income securities — short term |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 6.0 |  |
U.S. fixed income securities — intermediate term |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 58.4 | 58.7 |
U.S. fixed income securities — high yield |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 22.2 | 18.9 |
International fixed income securities — other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 43.0 | 37.2 |
Insurance contracts |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 34.0 |  |
Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 12.0 | 16.7 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 212.6 | 210.6 |
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 | 88.7 | 82.3 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | International equities — growth |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 46.5 | 46.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | International equities — other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 7.0 | 6.9 |
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 | 58.4 | 58.7 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 12.0 | 16.7 |
Significant Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 155.0 | 150.1 |
Significant Observable Inputs (Level 2) | U.S. equities — large cap |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 30.1 | 25.9 |
Significant Observable Inputs (Level 2) | U.S. equities — small/mid cap and other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 25.8 | 22.7 |
Significant Observable Inputs (Level 2) | International equities — other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 33.9 | 45.4 |
Significant Observable Inputs (Level 2) | U.S. fixed income securities — high yield |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 22.2 | 18.9 |
Significant Observable Inputs (Level 2) | International fixed income securities — other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 43.0 | 37.2 |
Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 34.0 |  |
Significant Unobservable Inputs (Level 3) | Insurance contracts |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 34.0 |  |
Assets Measured at Net Asset Value |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 38.3 | 31.5 |
Assets Measured at Net Asset Value | International equities — other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 19.7 |  |
Assets Measured at Net Asset Value | Alternative investment funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | 12.6 | $ 31.5 |
Assets Measured at Net Asset Value | U.S. fixed income securities — short term |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plan assets | $ 6.0 |  |

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