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Pension and Postretirement Benefits (Fair Value of Pension Plan Assets) (Details) - Pension Plan - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value $ 83.5 $ 79.2 $ 105.4
Active Markets for Identical Assets Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value 0.5 1.0  
Other Observable Inputs Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value 8.2 10.8  
Unobservable Inputs Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value 19.4 16.5  
Net Asset Value ("NAV") Practical Expedient      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value 55.4 50.9  
Cash Equivalents and Money Markets      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value 0.5 1.0  
Cash Equivalents and Money Markets | Active Markets for Identical Assets Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value 0.5 1.0  
Cash Equivalents and Money Markets | Other Observable Inputs Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value 0.0 0.0  
Cash Equivalents and Money Markets | Unobservable Inputs Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value 0.0 0.0  
Non-U.S. Equity Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value 12.3 10.0  
Non-U.S. Equity Funds | Net Asset Value ("NAV") Practical Expedient      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value 12.3 10.0  
Collective Trust      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value 40.1 35.3  
Collective Trust | Active Markets for Identical Assets Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value 0.0 0.0  
Collective Trust | Other Observable Inputs Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value 0.0 0.0  
Collective Trust | Unobservable Inputs Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value 19.4 16.5  
Collective Trust | Net Asset Value ("NAV") Practical Expedient      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value 20.7 18.8  
Non-U.S. Fixed Income, Government and Corporate      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value 22.4 21.3  
Non-U.S. Fixed Income, Government and Corporate | Net Asset Value ("NAV") Practical Expedient      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value 22.4 21.3  
Insurance / Annuity Contract(s)      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value 8.2 10.8  
Insurance / Annuity Contract(s) | Active Markets for Identical Assets Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value 0.0 0.0  
Insurance / Annuity Contract(s) | Other Observable Inputs Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value 8.2 10.8  
Insurance / Annuity Contract(s) | Unobservable Inputs Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value $ 0.0 0.0  
International Property Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value   0.8  
International Property Funds | Active Markets for Identical Assets Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value   0.0  
International Property Funds | Other Observable Inputs Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value   0.0  
International Property Funds | Unobservable Inputs Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value   0.0  
International Property Funds | Net Asset Value ("NAV") Practical Expedient      
Defined Benefit Plan Disclosure [Line Items]      
Total Fair Value   $ 0.8