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Pension and Other Postretirement Benefits - Fair Value Hierarchy (Details) - Pension - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets $ 224.8 $ 216.6 $ 329.7
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 0.0 0.0  
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 0.0 0.0  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 0.0 0.0  
Assets measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 224.8 216.6  
Cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 4.6 1.3  
Cash | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 0.0 0.0  
Cash | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 0.0 0.0  
Cash | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 0.0 0.0  
Cash | Assets measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 4.6 1.3  
Global equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 100.0 99.0  
Global equity | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 0.0 0.0  
Global equity | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 0.0 0.0  
Global equity | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 0.0 0.0  
Global equity | Assets measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 100.0 99.0  
Diversified credit      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 34.7 40.1  
Diversified credit | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 0.0 0.0  
Diversified credit | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 0.0 0.0  
Diversified credit | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 0.0 0.0  
Diversified credit | Assets measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 34.7 40.1  
Real assets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 22.8 30.4  
Real assets | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 0.0 0.0  
Real assets | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 0.0    
Real assets | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 0.0 0.0  
Real assets | Assets measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 22.8 30.4  
Liability hedging assets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 62.7 45.8  
Liability hedging assets | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 0.0 0.0  
Liability hedging assets | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 0.0 0.0  
Liability hedging assets | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 0.0 0.0  
Liability hedging assets | Assets measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets $ 62.7 $ 45.8