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Retirement Plans and Postretirement Benefits - (Tables)
3 Months Ended
Mar. 31, 2024
Retirement Benefits [Abstract]  
Components of Net Periodic Cost of Pension and Other Postretirement Employee Benefit Plans
The following table details the components of net periodic cost of our company-sponsored pension and other postretirement employee benefit plans for the periods presented:
 Quarter Ended March 31,
Pension Benefit Plans20242023
Service cost$0.6 $0.9 
Interest cost3.0 3.1 
Expected return on plan assets(3.9)(3.8)
Net periodic cost $(0.3)$0.2 

 Quarter Ended March 31,
Other Postretirement Employee Benefit Plans20242023
Service cost$0.1 $— 
Interest cost0.7 0.7 
Amortization of actuarial gain(0.1)(0.1)
Net periodic cost$0.6 $0.6