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Retirement Benefits Plans (Tables)
 6 Months Ended
Jun. 30, 2017
Retirement Benefits [Abstract]  
Postretirement Benefit Plans Expense (Benefit)
The postretirement benefit plans are unfunded and the costs are borne by the Company. The expense from these plans consisted of the following components:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2017
 
2016
 
2017
 
2016
 
 
 
 
 
 
 
 
 
 
 
(Dollars in millions)
Interest cost on benefit obligations
 
$
0.3

 
$
0.3

 
$
0.6

 
$
0.6

Amortization of:
 
 
 
 
 
 
 

Actuarial losses
 
0.2

 
0.2

 
0.4

 
0.4

Prior service benefit
 
(0.2
)
 
(0.2
)
 
(0.4
)
 
(0.4
)
Total expense
 
$
0.3

 
$
0.3

 
$
0.6

 
$
0.6