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Pension Benefits - Fair Value Plan Assets Measurements (Details) - Pension Plans, Defined Benefit - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | $ 664.6 | $ 525.3 | $ 579.8
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 400.2 | 256.4 |
Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 128.9 | 122.9 |
Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.0 | 0.3 | $ 0.3
United States Government and Government Agencies and Authorities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 158.4 | 110.9 |
United States Government and Government Agencies and Authorities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 158.4 | 110.9 |
United States Government and Government Agencies and Authorities | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.0 | 0.0 |
United States Government and Government Agencies and Authorities | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.0 | 0.0 |
States and Political Subdivisions |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.1 | 2.1 |
States and Political Subdivisions | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.0 | 0.0 |
States and Political Subdivisions | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.1 | 2.1 |
States and Political Subdivisions | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.0 | 0.0 |
Corporate Bonds and Notes |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 107.3 | 103.4 |
Corporate Bonds and Notes | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.0 | 0.0 |
Corporate Bonds and Notes | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 107.3 | 103.4 |
Corporate Bonds and Notes | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.0 | 0.0 |
Preferred Stock Finance Insurance and Real Estate [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets |  | 0.0 |
Preferred Stock Finance Insurance and Real Estate [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets |  | 0.0 |
Preferred Stock Finance Insurance and Real Estate [Member] | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets |  | 0.0 |
Preferred Stock Finance Insurance and Real Estate [Member] | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets |  | 0.0 |
Common Stocks Manufacturing [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets |  | 0.0 |
Common Stocks Manufacturing [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets |  | 0.0 |
Common Stocks Manufacturing [Member] | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets |  | 0.0 |
Common Stocks Manufacturing [Member] | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets |  | 0.0 |
Other Industries |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 161.5 | 123.4 |
Other Industries | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 140.0 | 106.0 |
Other Industries | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 21.5 | 17.4 |
Other Industries | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.0 | 0.0 |
Collective Investment Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 71.8 | 68.6 |
Collective Investment Funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.0 | 0.0 |
Collective Investment Funds | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.0 | 0.0 |
Collective Investment Funds | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.0 | 0.0 |
Bond Exchange Traded Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 92.8 | 34.1 |
Bond Exchange Traded Funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 92.8 | 34.1 |
Bond Exchange Traded Funds | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.0 | 0.0 |
Bond Exchange Traded Funds | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.0 | 0.0 |
Limited Liability Companies and Limited Partnerships |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 63.7 | 77.1 |
Limited Liability Companies and Limited Partnerships | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.0 | 0.0 |
Limited Liability Companies and Limited Partnerships | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.0 | 0.0 |
Limited Liability Companies and Limited Partnerships | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.0 | 0.0 |
Short-term Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 10.0 | 4.4 |
Short-term Investments | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 10.0 | 4.4 |
Short-term Investments | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.0 | 0.0 |
Short-term Investments | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.0 | 0.0 |
Receivables and Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | (1.0) | 1.3 |
Receivables and Other | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | (1.0) | 1.0 |
Receivables and Other | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.0 | 0.0 |
Receivables and Other | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.0 | 0.3 |
Measured at Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 135.5 | 145.7 |
Measured at Net Asset Value | United States Government and Government Agencies and Authorities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.0 | 0.0 |
Measured at Net Asset Value | States and Political Subdivisions |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.0 | 0.0 |
Measured at Net Asset Value | Corporate Bonds and Notes |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.0 | 0.0 |
Measured at Net Asset Value | Preferred Stock Finance Insurance and Real Estate [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets |  | 0.0 |
Measured at Net Asset Value | Common Stocks Manufacturing [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets |  | 0.0 |
Measured at Net Asset Value | Other Industries |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.0 | 0.0 |
Measured at Net Asset Value | Collective Investment Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 71.8 | 68.6 |
Measured at Net Asset Value | Bond Exchange Traded Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.0 | 0.0 |
Measured at Net Asset Value | Limited Liability Companies and Limited Partnerships |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 63.7 | 77.1 |
Measured at Net Asset Value | Short-term Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.0 | 0.0 |
Measured at Net Asset Value | Receivables and Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | $ 0.0 | $ 0.0 |

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