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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