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Retirement Benefits Plans (Tables)
 3 Months Ended
Mar. 31, 2016
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Postretirement benefit plans benefit
Postretirement benefit plans expense (benefit) consisted of the following components:
 
 
Three Months Ended March 31,
 
 
2016
 
2015
 
 
 
 
 
 
 
(Dollars in millions)
Interest cost on benefit obligations
 
$
0.3

 
$
0.3

Amortization of:
 
 
 
 
Actuarial losses
 
0.2

 
0.2

Prior service benefit
 
(0.2
)
 
(0.4
)
Curtailment gain
 
—

 
(4.0
)
Total expense (benefit)
 
$
0.3

 
$
(3.9
)