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Pension and Other Post-Retirement Benefits
 3 Months Ended
Mar. 31, 2013
Compensation and Retirement Disclosure [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 benefit expense for the three months ended March 31, 2013 and 2012 (in millions):
 
2013 Pension
Benefits
 
2012 Pension
Benefits
 
2013 Retiree
Health and
Life
 
2012 Retiree
Health and
Life
Service cost
$
1.8

 
$
1.5

 
$
0.1

 
$
0.1

Interest cost
4.6

 
4.9

 
0.4

 
0.5

Expected return on plan assets
(6.9
)
 
(7.4
)
 
—

 
—

Amortization of (a):
 
 
 
 
 
 
 
Unrecognized prior service credit
(0.3
)
 
(0.3
)
 
—

 
—

Unrecognized net actuarial loss
3.5

 
2.5

 
0.1

 
—

Net expense
$
2.7

 
$
1.2

 
$
0.6

 
$
0.6

________________
(a)
Amounts are reclassified from accumulated other comprehensive loss.