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Pension and Other Post-Retirement Benefits
 6 Months Ended
Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Pension and Other Post-Retirement Benefits

The following table shows components of our pension and other post-retirement benefits expense for the three months ended June 30, 2017 and 2016 (in millions):
 
2017 Pension
Benefits
 
2016 Pension
Benefits
 
2017 Retiree
Health
and Life
 
2016 Retiree
Health
and Life
Service cost
$
1.7

 
$
1.4

 
$
0.1

 
$
0.1

Interest cost
3.9

 
4.0

 
0.3

 
0.2

Expected return on plan assets
(6.0
)
 
(6.5
)
 
—

 
—

Settlement expense
0.1

 
—

 
—

 
—

Amortization of (1):
 
 
 
 
 
 
 
Unrecognized prior service credit
—

 
(0.3
)
 
(0.1
)
 
—

Unrecognized net actuarial loss (gain)
2.4

 
2.5

 
(0.1
)
 
(0.2
)
Net expense
$
2.1

 
$
1.1

 
$
0.2

 
$
0.1


The following table shows components of our pension and other post-retirement benefits expense for the six months ended June 30, 2017 and 2016 (in millions):
 
2017 Pension
Benefits
 
2016 Pension
Benefits
 
2017 Retiree
Health
and Life
 
2016 Retiree
Health
and Life
Service cost
$
3.3

 
$
3.0

 
$
0.1

 
$
0.1

Interest cost
7.7

 
7.9

 
0.5

 
0.5

Expected return on plan assets
(12.0
)
 
(13.0
)
 
—

 
—

Settlement expense
0.1

 
—

 
—

 
—

Amortization of (1):
 
 
 
 
 
 
 
Unrecognized prior service credit
—

 
(0.5
)
 
(0.1
)
 
(0.1
)
Unrecognized net actuarial loss (gain)
4.7

 
5.1

 
(0.2
)
 
(0.2
)
Net expense
$
3.8

 
$
2.5

 
$
0.3

 
$
0.3

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