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Pension and Other Post-Retirement Benefits
 9 Months Ended
Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Pension and Other Post-Retirement Benefits
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 September 30, 2015 and 2014 (in millions):
 
2015 Pension
Benefits
 
2014 Pension
Benefits
 
2015 Retiree
Health
and Life
 
2014 Retiree
Health
and Life
Service cost
$
1.9

 
$
1.5

 
$
0.1

 
$
—

Interest cost
4.9

 
5.2

 
0.3

 
0.4

Expected return on plan assets
(6.4
)
 
(7.1
)
 
—

 
—

Amortization of (1):
 
 
 
 
 
 
 
Unrecognized prior service credit
(0.3
)
 
(0.3
)
 
(0.1
)
 
—

Unrecognized net actuarial loss
3.7

 
2.8

 
—

 
—

Net expense
$
3.8

 
$
2.1

 
$
0.3

 
$
0.4


The following table shows components of our pension and other post-retirement benefits expense for the nine months ended September 30, 2015 and 2014 (in millions):
 
2015 Pension
Benefits
 
2014 Pension
Benefits
 
2015 Retiree
Health
and Life
 
2014 Retiree
Health
and Life
Service cost
$
5.6

 
$
4.5

 
$
0.2

 
$
0.1

Interest cost
14.8

 
15.6

 
1.0

 
1.2

Expected return on plan assets
(19.3
)
 
(21.4
)
 
—

 
—

Amortization of (1):
 
 
 
 
 
 
 
Unrecognized prior service credit
(0.8
)
 
(0.8
)
 
(0.2
)
 
(0.1
)
Unrecognized net actuarial loss (gain)
11.1

 
8.5

 
—

 
(0.1
)
Net expense
$
11.4

 
$
6.4

 
$
1.0

 
$
1.1

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