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Pension and Other Post-Retirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2016
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 six months ended June 30, 2016 and 2015 (in millions):
 
2016 Pension
Benefits
 
2015 Pension
Benefits
 
2016 Retiree
Health
and Life
 
2015 Retiree
Health
and Life
Service cost
$
3.0

 
$
3.7

 
$
0.1

 
$
0.1

Interest cost
7.9

 
9.9

 
0.5

 
0.7

Expected return on plan assets
(13.0
)
 
(12.9
)
 
—

 
—

Amortization of (1):
 
 
 
 
 
 
 
Unrecognized prior service credit
(0.5
)
 
(0.5
)
 
(0.1
)
 
(0.1
)
Unrecognized net actuarial loss (gain)
5.1

 
7.4

 
(0.2
)
 
—

Net expense
$
2.5

 
$
7.6

 
$
0.3

 
$
0.7

 
2016 Pension
Benefits
 
2015 Pension
Benefits
 
2016 Retiree
Health
and Life
 
2015 Retiree
Health
and Life
Service cost
$
1.4

 
$
2.0

 
$
0.1

 
$
0.1

Interest cost
4.0

 
5.0

 
0.2

 
0.3

Expected return on plan assets
(6.5
)
 
(6.4
)
 
—

 
—

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

 
(0.1
)
Unrecognized net actuarial loss (gain)
2.5

 
3.9

 
(0.2
)
 
—

Net expense
$
1.1

 
$
4.2

 
$
0.1

 
$
0.3