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Employee Benefit Plans and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2016
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 September 30
 
Nine Months Ended September 30
 
2016
 
2015
 
2016
 
2015
Service cost
$
6.2

 
$
6.1

 
$
18.4

 
$
17.9

Interest cost
10.2

 
11.6

 
30.6

 
34.6

Expected return on plan assets
(12.3
)
 
(13.3
)
 
(37.1
)
 
(39.8
)
Net amortization of unrecognized amounts
 
 
 
 
 
 
 
Prior service cost
1.4

 
1.4

 
4.3

 
4.2

Actuarial loss
1.5

 
2.1

 
4.3

 
6.4

Net periodic benefit cost
$
7.0

 
$
7.9

 
$
20.5

 
$
23.3



The components of net periodic benefit cost for our postretirement plans were as follows (dollars in millions):
 
Postretirement Plans
 
Three Months Ended September 30
 
Nine Months Ended September 30
 
2016
 
2015
 
2016
 
2015
Service cost
$
0.1

 
$
0.4

 
$
0.5

 
$
1.3

Interest cost
0.1

 
0.3

 
0.5

 
0.9

Net amortization of unrecognized amounts
 
 
 
 
 
 
 
Prior service cost
(0.1
)
 
—

 
(0.1
)
 
—

Actuarial (income) loss
—

 
—

 
(0.4
)
 
0.1

Net periodic benefit cost
$
0.1

 
$
0.7

 
$
0.5

 
$
2.3