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Pension and Other Post-Retirement Benefits (Tables)
 6 Months Ended
Jun. 30, 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 June 30, 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

 
$
1.5

 
$
0.1

 
$
0.1

Interest cost
3.0

 
3.8

 
0.2

 
0.3

Expected return on plan assets
(5.0
)
 
(5.5
)
 
—

 
—

Amortization of (1):
 
 
 
 
 
 
 
Unrecognized prior service credit
—

 
—

 
(0.1
)
 
(0.1
)
Unrecognized net actuarial loss (gain)
3.3

 
2.1

 
(0.2
)
 
(0.1
)
Net periodic cost
$
3.3

 
$
1.9

 
$
—

 
$
0.2



The following table shows the components of our pension and other post-retirement benefits expense for the six months ended June 30, 2020 and 2019 (in millions):

 
 
 
 
2020
Pension
Benefits
 
2019
Pension
Benefits
 
2020
Retiree Health and Life
 
2019
Retiree Health and Life
Service cost
$
4.0

 
$
3.2

 
$
0.1

 
$
0.1

Interest cost
6.1

 
7.6

 
0.3

 
0.5

Expected return on plan assets
(10.1
)
 
(11.0
)
 
—

 
—

Amortization of (1):
 
 
 
 
 
 
 
Unrecognized prior service credit
—

 
—

 
(0.1
)
 
(0.1
)
Unrecognized net actuarial loss (gain)
6.4

 
4.0

 
(0.2
)
 
(0.1
)
Net periodic cost
$
6.4

 
$
3.8

 
$
0.1

 
$
0.4

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