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Pension Benefits - Fair Value Plan Assets Measurements (Details) - Pension Plans, Defined Benefit - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Pension plan assets $ 391.7 $ 405.4 $ 664.6
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan assets 320.3 249.7  
Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan assets 63.0 82.0  
Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan assets 0.0 0.0  
United States Government and Government Agencies and Authorities      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan assets 54.6 68.3  
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 54.6 68.3  
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 0.7  
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 0.7  
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 62.3 81.3  
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 62.3 81.3  
Corporate Bonds and Notes | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan assets 0.0 0.0  
Other Industries      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan assets   64.8  
Other Industries | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan assets   64.8  
Other Industries | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan assets   0.0  
Other Industries | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan assets   0.0  
Collective Investment Funds      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan assets   32.1  
Collective Investment Funds | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan assets   0.0  
Collective Investment Funds | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan assets   0.0  
Collective Investment Funds | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan assets   0.0  
Bond Exchange Traded Funds      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan assets 125.0 108.6  
Bond Exchange Traded Funds | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan assets 125.0 108.6  
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 8.4 41.6  
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 140.2 7.4  
Short-term Investments | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan assets 140.2 7.4  
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 0.5 0.6  
Receivables and Other | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan assets 0.5 0.6  
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 0.0  
Foreign Governments      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan assets 0.6    
Foreign Governments | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan assets 0.6    
Measured at Net Asset Value      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan assets 8.4 73.7  
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 | Other Industries      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan assets   0.0  
Measured at Net Asset Value | Collective Investment Funds      
Defined Benefit Plan Disclosure [Line Items]      
Pension plan assets   32.1  
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 8.4 41.6  
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