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Retirement Plans - Fair Value of Pension Assets (Details) - Pensions - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Pension and other postretirement benefit asset $ 26.0 $ 26.6 $ 23.1
Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Pension and other postretirement benefit asset 26.0 26.6  
Fair Value, Measurements, Recurring | Cash and short-term investments      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Pension and other postretirement benefit asset 0.1 0.2  
Fair Value, Measurements, Recurring | Mutual funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Pension and other postretirement benefit asset 0.8 7.9  
Fair Value, Measurements, Recurring | Pooled funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Pension and other postretirement benefit asset 23.1 16.6  
Fair Value, Measurements, Recurring | Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Pension and other postretirement benefit asset 2.0 1.9  
Fair Value, Measurements, Recurring | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Pension and other postretirement benefit asset 0.9 8.1  
Fair Value, Measurements, Recurring | Level 1 | Cash and short-term investments      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Pension and other postretirement benefit asset 0.1 0.2  
Fair Value, Measurements, Recurring | Level 1 | Mutual funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Pension and other postretirement benefit asset 0.8 7.9  
Fair Value, Measurements, Recurring | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Pension and other postretirement benefit asset 2.0 1.9  
Fair Value, Measurements, Recurring | Level 2 | Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Pension and other postretirement benefit asset 2.0 1.9  
Fair Value, Measurements, Recurring | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Pension and other postretirement benefit asset 0.0 0.0  
Fair Value, Measurements, Recurring | Investments Measured at Net Asset Value      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Pension and other postretirement benefit asset 23.1 16.6  
Fair Value, Measurements, Recurring | Investments Measured at Net Asset Value | Pooled funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Pension and other postretirement benefit asset $ 23.1 $ 16.6