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Pension and Other Post-Retirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Pension obligations and plan assets and other post-retirement obligations
The following table shows components of our pension and other post-retirement benefits expense for the three months ended June 30, 2015 and 2014 (in millions):
 
2015 Pension
Benefits
 
2014 Pension
Benefits
 
2015 Retiree
Health
and Life
 
2014 Retiree
Health
and Life
Service cost
$
2.0

 
$
1.6

 
$
0.1

 
$
0.1

Interest cost
5.0

 
5.3

 
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
)
 
(0.1
)
Unrecognized net actuarial loss (gain)
3.9

 
3.1

 
—

 
(0.1
)
Net expense
$
4.2

 
$
2.6

 
$
0.3

 
$
0.3


The following table shows components of our pension and other post-retirement benefits expense for the six months ended June 30, 2015 and 2014 (in millions):
 
2015 Pension
Benefits
 
2014 Pension
Benefits
 
2015 Retiree
Health
and Life
 
2014 Retiree
Health
and Life
Service cost
$
3.7

 
$
3.0

 
$
0.1

 
$
0.1

Interest cost
9.9

 
10.4

 
0.7

 
0.8

Expected return on plan assets
(12.9
)
 
(14.3
)
 
—

 
—

Amortization of (1):
 
 
 
 
 
 
 
Unrecognized prior service credit
(0.5
)
 
(0.5
)
 
(0.1
)
 
(0.1
)
Unrecognized net actuarial loss (gain)
7.4

 
5.7

 
—

 
(0.1
)
Net expense
$
7.6

 
$
4.3

 
$
0.7

 
$
0.7

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