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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2016
Pension Plan  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Net Periodic Benefit Costs
The following table outlines the amount of net periodic benefit expense for the three-month period ended March 31, 2016:
(Dollars in millions)
U.S. Qualified Plans
 
U.S. Non-Qualified Plans
 
UK Plans
Net periodic benefit expense (income):
 
 
 
 
 
Interest cost
$
19.0

 
$
0.8

 
$
11.5

Expected return on plan assets
(22.1
)
 
—

 
(14.9
)
Net periodic benefit expense (income)
$
(3.1
)
 
$
0.8

 
$
(3.4
)
Postretirement Health Coverage  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Net Periodic Benefit Costs
The following table sets forth the amount of net periodic benefit expense for the three-month period ended March 31, 2016:
(Dollars in millions)
Three Months Ended March 31, 2016
Net periodic benefit expense:
 
Service cost - benefits earned during the year
$
0.2

Interest cost on projected benefit obligation
0.5

Net periodic benefit expense
$
0.7