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Employee Benefit Plans and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Costs
The components of net periodic benefit cost for our pension plans were as follows (dollars in millions):
 
Pension Plans
 
Three Months Ended June 30
 
Six Months Ended
June 30
 
2015
 
2014
 
2015
 
2014
Service cost
$
6.0

 
$
5.8

 
$
11.8

 
$
11.6

Interest cost
11.5

 
11.5

 
23.0

 
22.9

Expected return on plan assets
(13.3
)
 
(12.7
)
 
(26.6
)
 
(25.4
)
Net amortization of unrecognized amounts
 
 
 
 
 
 
 
Prior service cost
1.4

 
1.6

 
2.8

 
3.3

Actuarial loss
2.2

 
0.2

 
4.3

 
0.3

Net periodic benefit cost
$
7.8

 
$
6.4

 
$
15.3

 
$
12.7



The components of net periodic benefit cost for our postretirement plans were as follows (dollars in millions):
 
Postretirement Plans
 
Three Months Ended June 30
 
Six Months Ended
June 30
 
2015
 
2014
 
2015
 
2014
Service cost
$
0.4

 
$
0.4

 
$
0.8

 
$
0.8

Interest cost
0.3

 
0.3

 
0.6

 
0.6

Net amortization of unrecognized amounts
 
 
 
 
 
 
 
Prior service cost
—

 
—

 
—

 
(0.1
)
Actuarial loss
—

 
—

 
0.1

 
0.1

Net periodic benefit cost
$
0.7

 
$
0.7

 
$
1.5

 
$
1.4