v3.24.0.1
Employee Benefit Plans (Fair Value Measurements) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 171.2 $ 178.2 $ 221.8
Quoted Prices in Active Markets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 49.5 23.6  
Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 121.7 154.6  
Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Money market accounts and U.S. government securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 49.5    
Money market accounts and U.S. government securities | Quoted Prices in Active Markets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 49.5    
Money market accounts and U.S. government securities | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Money market accounts and U.S. government securities | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Money market accounts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   23.6  
Money market accounts | Quoted Prices in Active Markets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   23.6  
Money market accounts | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.0  
Money market accounts | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.0  
Fixed income securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 121.7    
Fixed income securities | Quoted Prices in Active Markets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Fixed income securities | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 121.7    
Fixed income securities | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0.0    
Mutual funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   154.6  
Mutual funds | Quoted Prices in Active Markets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.0  
Mutual funds | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   154.6  
Mutual funds | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   $ 0.0