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Pension and Other Postretirement Benefits - Fair Value Hierarchy (Details) - Pension - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets $ 245.1 $ 256.8 $ 216.6
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 32.6 31.4  
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 0.6 0.6  
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 211.9 224.8  
Cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 3.5 5.0  
Cash | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 0.7 0.4  
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 2.8 4.6  
Global equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 128.1 119.7  
Global equity | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 20.0 19.7  
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 108.1 100.0  
Diversified credit      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 47.1 45.9  
Diversified credit | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 11.8 11.2  
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 35.3 34.7  
Real assets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 23.1 22.8  
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 23.1 22.8  
Liability hedging assets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 42.6 62.7  
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 42.6 62.7  
Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 0.7 0.7  
Other | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 0.1 0.1  
Other | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 0.6 0.6  
Other | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets 0.0 0.0  
Other | Assets measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of assets $ 0.0 $ 0.0