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Pension and Other Post-Retirement Benefits
 6 Months Ended
Jun. 30, 2014
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 June 30, 2014 and 2013 (in millions):
 
2014 Pension
Benefits
 
2013 Pension
Benefits
 
2014 Retiree
Health
and Life
 
2013 Retiree
Health
and Life
Service cost
$
1.6

 
$
1.6

 
$
0.1

 
$
—

Interest cost
5.3

 
4.6

 
0.4

 
0.4

Expected return on plan assets
(7.1
)
 
(6.9
)
 
—

 
—

Amortization of (1):
 
 
 
 
 
 
 
Unrecognized prior service credit
(0.3
)
 
(0.2
)
 
(0.1
)
 
(0.1
)
Unrecognized net actuarial loss (gain)
3.1

 
4.0

 
(0.1
)
 
(0.1
)
Net expense
$
2.6

 
$
3.1

 
$
0.3

 
$
0.2


The following table shows components of our pension and other post-retirement benefits expense for the six months ended June 30, 2014 and 2013 (in millions):
 
2014 Pension
Benefits
 
2013 Pension
Benefits
 
2014 Retiree
Health
and Life
 
2013 Retiree
Health
and Life
Service cost
$
3.0

 
$
3.4

 
$
0.1

 
$
0.1

Interest cost
10.4

 
9.2

 
0.8

 
0.8

Expected return on plan assets
(14.3
)
 
(13.8
)
 
—

 
—

Amortization of (1):
 
 
 
 
 
 
 
Unrecognized prior service credit
(0.5
)
 
(0.5
)
 
(0.1
)
 
(0.1
)
Unrecognized net actuarial loss (gain)
5.7

 
7.5

 
(0.1
)
 
—

Net expense
$
4.3

 
$
5.8

 
$
0.7

 
$
0.8

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