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Discontinued Operations (Tables)
 12 Months Ended
Dec. 31, 2016
Discontinued Operations and Disposal Groups [Abstract]  
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures
Summary financial information included in Income from Discontinued Operations for the years ended December 31, 2016, 2015 and 2014 is presented below.
DOLLARS IN MILLIONS, EXCEPT PER SHARE AMOUNTS
 
2016
 
2015
 
2014
Income from Discontinued Operations before Income Taxes:
 
 
 
 
 
 
Change in Estimate of Retained Liabilities Arising from Discontinued Operations
 
6.3

 
8.6

 
3.0

Income Tax Expense
 
(2.2
)
 
(3.1
)
 
(1.1
)
Income from Discontinued Operations
 
$
4.1

 
$
5.5

 
$
1.9

 
 
 
 
 
 
 
Income from Discontinued Operations Per Unrestricted Share:
 
 
 
 
 
 
Basic
 
$
0.08

 
$
0.10

 
$
0.04

Diluted
 
$
0.08

 
$
0.10

 
$
0.04