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Pension and Other Post-Retirement Benefits
 3 Months Ended
Mar. 31, 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 March 31, 2015 and 2014 (in millions):
 
2015 Pension
Benefits
 
2014 Pension
Benefits
 
2015 Retiree
Health
and Life
 
2014 Retiree
Health
and Life
Service cost
$
1.7

 
$
1.4

 
$
—

 
$
—

Interest cost
4.9

 
5.1

 
0.4

 
0.4

Expected return on plan assets
(6.5
)
 
(7.2
)
 
—

 
—

Amortization of (1):
 
 
 
 
 
 
 
Unrecognized prior service credit
(0.2
)
 
(0.2
)
 
—

 
—

Unrecognized net actuarial loss
3.5

 
2.6

 
—

 
—

Net expense
$
3.4

 
$
1.7

 
$
0.4

 
$
0.4

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