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Discontinued Operations (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018, 2017 and 2016 is presented below.
DOLLARS IN MILLIONS, EXCEPT PER SHARE AMOUNTS
 
2018
 
2017
 
2016
Income from Discontinued Operations before Income Taxes:
 
 
 
 
 
 
Change in Estimate of Retained Liabilities Arising from Discontinued Operations
 
$
2.4

 
$
1.5

 
$
6.3

Income Tax Expense
 
(0.7
)
 
(0.5
)
 
(2.2
)
Income from Discontinued Operations
 
$
1.7

 
$
1.0

 
$
4.1

 
 
 
 
 
 
 
Income from Discontinued Operations Per Unrestricted Share:
 
 
 
 
 
 
Basic
 
$
0.03

 
$
0.02

 
$
0.08

Diluted
 
$
0.03

 
$
0.02

 
$
0.08