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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2015
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
Schedule II.
Valuation and Qualifying Accounts 
 
 
Beginning
 
Charge
 
Deductions/
 
End
(dollars in millions)
 
of Period
 
to Expenses
 
(Additions)
 
of Period
Allowance for Doubtful Accounts
 
 
 
 
 
 
 
 
2015
 
$
1.0

 
$
—

 
$
—

 
$
1.0

2014
 
0.5

 
0.8

 
0.3

 
1.0

2013
 
0.3

 
0.4

 
0.2

 
0.5

Deferred Tax Valuation Allowance
 
 
 
 
 
 
 
 
2015
 
$
5.7

 
$
0.6

 
$
—

 
$
6.3

2014
 
3.6

 
2.1

 
—

 
5.7

2013
 
1.9

 
1.7

 
—

 
3.6