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Retirement Plans and Postretirement Benefits - Schedule of Plan Assets Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]      
Total $ 662.8 $ 185.3 $ 0.0
Diversified Growth Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total 84.5 32.4  
Liability Driven Instrument      
Defined Benefit Plan Disclosure [Line Items]      
Total 226.4 113.7  
Property      
Defined Benefit Plan Disclosure [Line Items]      
Total 28.1 0.0  
Credit      
Defined Benefit Plan Disclosure [Line Items]      
Total 92.3 0.0  
Private Markets      
Defined Benefit Plan Disclosure [Line Items]      
Total 37.8 0.0  
Equity      
Defined Benefit Plan Disclosure [Line Items]      
Total 26.1 0.0  
Fixed Income Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total 17.4 0.0  
Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Total 150.2 39.2  
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total 109.6 39.2  
Level 1 | Diversified Growth Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total 0.0 0.0  
Level 1 | Liability Driven Instrument      
Defined Benefit Plan Disclosure [Line Items]      
Total 0.0 0.0  
Level 1 | Property      
Defined Benefit Plan Disclosure [Line Items]      
Total 0.0 0.0  
Level 1 | Credit      
Defined Benefit Plan Disclosure [Line Items]      
Total 0.0 0.0  
Level 1 | Private Markets      
Defined Benefit Plan Disclosure [Line Items]      
Total 0.0 0.0  
Level 1 | Equity      
Defined Benefit Plan Disclosure [Line Items]      
Total 0.0 0.0  
Level 1 | Fixed Income Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total 0.0 0.0  
Level 1 | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Total 109.6 39.2  
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total 469.9 146.1  
Level 2 | Diversified Growth Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total 84.5 32.4  
Level 2 | Liability Driven Instrument      
Defined Benefit Plan Disclosure [Line Items]      
Total 226.4 113.7  
Level 2 | Property      
Defined Benefit Plan Disclosure [Line Items]      
Total 0.0 0.0  
Level 2 | Credit      
Defined Benefit Plan Disclosure [Line Items]      
Total 92.3 0.0  
Level 2 | Private Markets      
Defined Benefit Plan Disclosure [Line Items]      
Total 0.0 0.0  
Level 2 | Equity      
Defined Benefit Plan Disclosure [Line Items]      
Total 26.1 0.0  
Level 2 | Fixed Income Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total 0.0 0.0  
Level 2 | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Total 40.6 0.0  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Total 83.3 0.0  
Level 3 | Diversified Growth Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total 0.0 0.0  
Level 3 | Liability Driven Instrument      
Defined Benefit Plan Disclosure [Line Items]      
Total 0.0 0.0  
Level 3 | Property      
Defined Benefit Plan Disclosure [Line Items]      
Total 28.1 0.0  
Level 3 | Credit      
Defined Benefit Plan Disclosure [Line Items]      
Total 0.0 0.0  
Level 3 | Private Markets      
Defined Benefit Plan Disclosure [Line Items]      
Total 37.8 0.0  
Level 3 | Equity      
Defined Benefit Plan Disclosure [Line Items]      
Total 0.0 0.0  
Level 3 | Fixed Income Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total 17.4 0.0  
Level 3 | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Total $ 0.0 $ 0.0