XML 31 R18.htm IDEA: XBRL DOCUMENT v3.22.1
Components of Net Periodic Benefit Cost
 3 Months Ended
Mar. 31, 2022
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost Components of Net Periodic Benefit Cost
Pension Benefits
Three months ended March 31,
20222021
Service cost$1.1 $1.4 
Interest cost2.5 2.4 
Expected return on plan assets(5.8)(5.5)
Amortization of prior service costs0.0 0.0
Amortization of net loss0.7 1.5 
Net periodic benefit cost$(1.5)$(0.2)
Other Postretirement Benefits
Three months ended March 31,
20222021
Service cost$0.1 $0.1 
Interest cost0.7 0.6 
Amortization of prior service cost(0.5)(0.8)
Amortization of net loss0.5 0.6 
Net periodic benefit cost$0.8 $0.5