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Pension and Other Post-Retirement Benefits
3 Months Ended
Mar. 31, 2022
Retirement Benefits [Abstract]  
Pension and Other Post-Retirement Benefits Pension and Other Post-Retirement Benefits
The following table shows the components of net periodic cost for the three months ended March 31, 2022 and 2021 (in millions):

 
 
 
 
2022
Pension
Benefits
2021
Pension
Benefits
2022
Retiree
Health and Life
2021
Retiree
Health and Life
Service cost
$2.0 $2.2 $— $— 
Interest cost
2.6 2.0 0.1 0.1 
Expected return on plan assets
(4.0)(4.7)— — 
Amortization of (1):
Unrecognized prior service credit
— — — — 
Unrecognized net actuarial loss (gain)
2.2 3.4 (0.1)(0.1)
Net periodic cost
$2.8 $2.9 $— $— 
_______
(1) Amounts reclassified from accumulated other comprehensive loss.

The service cost component of net periodic cost is recorded in selling, general and administrative expense in the statements of comprehensive income, and the non-service components are recorded in other expense.