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Employee Benefit Plans and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Costs
The components of net periodic benefit cost were as follows (dollars in millions):
 
Pension Plans
 
Postretirement Plans
 
Three Months Ended
March 31
 
Three Months Ended
March 31
 
2015
 
2014
 
2015
 
2014
Service cost
$
5.9

 
$
5.8

 
$
0.4

 
$
0.4

Interest cost
11.5

 
11.4

 
0.3

 
0.3

Expected return on plan assets
(13.3
)
 
(12.7
)
 
—

 
—

Net amortization of unrecognized amounts
 
 
 
 
 
 
 
Prior service cost
1.4

 
1.6

 
—

 
—

Actuarial loss
2.1

 
0.2

 
0.1

 
—

Net periodic benefit cost
$
7.6

 
$
6.3

 
$
0.8

 
$
0.7