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Employee Benefit Plans and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2017
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 March 31
 
 
2017
 
2016
 
Service cost
$
6.1

 
$
6.1

 
Interest cost
10.4

 
10.2

 
Expected return on plan assets
(13.5
)
 
(12.4
)
 
Net amortization of unrecognized amounts
 
 
 
 
Prior service cost
1.5

 
1.4

 
Actuarial loss
1.9

 
1.4

 
Net periodic benefit cost
$
6.4

 
$
6.7

 


The components of net periodic benefit cost for our postretirement plans were as follows (dollars in millions):
 
Postretirement Plans
 
 
Three Months Ended March 31
 
 
2017
 
2016
 
Service cost
$
0.1

 
$
0.2

 
Interest cost
0.1

 
0.2

 
Amortization of actuarial (income) loss
—

 
(0.2
)
 
Net periodic benefit cost
$
0.2

 
$
0.2