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Pension and Other Post-Retirement Benefits
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Pension and Other Post-Retirement Benefits Pension and Other Post-Retirement Benefits

The following table shows the components of our pension and other post-retirement benefits expense for the three months ended June 30, 2019 and 2018 (in millions):

 
 
 
 
2019
Pension
Benefits
 
2018
Pension
Benefits
 
2019
Retiree Health and Life
 
2018
Retiree Health and Life
Service cost
$
1.5

 
$
2.2

 
$
0.1

 
$
—

Interest cost
3.8

 
3.7

 
0.3

 
0.3

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

 
—

Amortization of (1):
 
 
 
 
 
 
 
Unrecognized prior service credit
—

 
—

 
(0.1
)
 
(0.1
)
Unrecognized net actuarial loss
2.1

 
2.6

 
(0.1
)
 
—

Net periodic cost
$
1.9

 
$
3.0

 
$
0.2

 
$
0.2



The following table shows the components of our pension and other post-retirement benefits expense for the six months ended June 30, 2019 and 2018 (in millions):

 
 
 
 
2019
Pension
Benefits
 
2018
Pension
Benefits
 
2019
Retiree Health and Life
 
2018
Retiree Health and Life
Service cost
$
3.2

 
$
4.1

 
$
0.1

 
$
0.1

Interest cost
7.6

 
7.4

 
0.5

 
0.5

Expected return on plan assets
(11.0
)
 
(11.1
)
 
—

 
—

Amortization of (1):
 
 
 
 
 
 
 
Unrecognized prior service credit
—

 
—

 
(0.1
)
 
(0.1
)
Unrecognized net actuarial loss
4.0

 
5.1

 
(0.1
)
 
—

Net periodic cost
$
3.8

 
$
5.5

 
$
0.4

 
$
0.5

________
(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 of net periodic cost are recorded in other expense.