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Retirement Benefits - Fair Value of Pension Plan Assets (Details) - Pension Plans - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 234.3 $ 148.7 $ 131.6
Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   129.0  
Public equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 69.2 3.8  
Developed markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 86.5 2.5  
Emerging markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 13.3 9.1  
Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 29.5    
Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 35.8 4.3  
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 222.6 142.7  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   129.0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Public equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 66.8 1.9  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Developed markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 85.9 2.1  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Emerging markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 13.3 8.8  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 25.9    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 30.7 0.9  
Significant Observable  Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8.7 3.7  
Significant Observable  Inputs (Level 2) | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.0  
Significant Observable  Inputs (Level 2) | Public equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Significant Observable  Inputs (Level 2) | Developed markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Significant Observable  Inputs (Level 2) | Emerging markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.3  
Significant Observable  Inputs (Level 2) | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3.6    
Significant Observable  Inputs (Level 2) | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5.1 3.4  
Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Significant Unobservable Inputs (Level 3) | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.0  
Significant Unobservable Inputs (Level 3) | Public equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Significant Unobservable Inputs (Level 3) | Developed markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Significant Unobservable Inputs (Level 3) | Emerging markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Significant Unobservable Inputs (Level 3) | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Significant Unobservable Inputs (Level 3) | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Investments Valued at Net Asset Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3.0 2.3  
Investments Valued at Net Asset Value | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.0  
Investments Valued at Net Asset Value | Public equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2.4 1.9  
Investments Valued at Net Asset Value | Developed markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.6 0.4  
Investments Valued at Net Asset Value | Emerging markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Investments Valued at Net Asset Value | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Investments Valued at Net Asset Value | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0.0 $ 0.0