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Employee Benefit Plans - Schedule of Fair Value of Pension Plan Assets by Asset Category (Details) - Pension plans - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 200.6 $ 190.5 $ 173.6
Fair Value, Levels | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 1.2 1.2  
Fair Value, Levels | U.S. Treasury obligations      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Fair Value, Levels | Domestic corporate bonds and notes      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Fair Value, Levels | Foreign corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Quoted Prices in Active Markets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 1.2 1.2  
Quoted Prices in Active Markets (Level 1) | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 1.2 1.2  
Quoted Prices in Active Markets (Level 1) | U.S. Treasury obligations      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Quoted Prices in Active Markets (Level 1) | Domestic corporate bonds and notes      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Quoted Prices in Active Markets (Level 1) | Foreign corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Significant Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Significant Observable Inputs (Level 2) | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Significant Observable Inputs (Level 2) | U.S. Treasury obligations      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Significant Observable Inputs (Level 2) | Domestic corporate bonds and notes      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Significant Observable Inputs (Level 2) | Foreign corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.0 0.0  
Assets measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 199.4 $ 189.3