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Retirement Plans and Postretirement Benefits - (Tables)
3 Months Ended
Mar. 31, 2023
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 Plans20232022
Service cost$0.9 $0.5 
Interest cost3.1 2.2 
Expected return on plan assets(3.8)(2.8)
Amortization of actuarial loss— 1.5 
Net periodic cost $0.2 $1.5 
 Quarter Ended March 31,
Other Postretirement Employee Benefit Plans20232022
Service cost$— $0.1 
Interest cost0.7 0.5 
Amortization of actuarial gain(0.1)— 
Net periodic cost$0.6 $0.6