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Pension and Other Post-Retirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Components of pension and other post retirement benefit costs

The following table shows the components of our pension and other post-retirement net periodic cost for the three months ended March 31, 2020 and 2019 (in millions):

 
 
 
 
2020
Pension
Benefits
 
2019
Pension
Benefits
 
2020
Retiree Health and Life
 
2019
Retiree Health and Life
Service cost
$
2.0

 
$
1.7

 
$
—

 
$
—

Interest cost
3.1

 
3.8

 
0.1

 
0.2

Expected return on plan assets
(5.1
)
 
(5.5
)
 
—

 
—

Amortization of (1):
 
 
 
 
 
 
 
Unrecognized prior service credit
—

 
—

 
—

 
—

Unrecognized net actuarial loss
3.1

 
1.9

 
—

 
—

Net periodic cost
$
3.1

 
$
1.9

 
$
0.1

 
$
0.2


________
(1) Amounts reclassified from accumulated other comprehensive loss.