XML 120 R103.htm IDEA: XBRL DOCUMENT v3.22.4
Retirement Plans - Fair Value of Pension Assets (Details) - Pensions - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Pension and other postretirement benefit asset $ 23.1 $ 31.8 $ 31.2
Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Pension and other postretirement benefit asset 23.1 31.8  
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 0.2 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 6.7 9.2  
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 14.5 20.3  
Fair Value, Measurements, Recurring | Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Pension and other postretirement benefit asset 1.7 2.1  
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 6.9 9.4  
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 0.2 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 6.7 9.2  
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 1.7 2.1  
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 1.7 2.1  
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 14.5 20.3  
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 $ 14.5 $ 20.3