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Supplemental Disclosures (Tables)
 12 Months Ended
Dec. 31, 2015
SUPPLEMENTAL DISCLOSURES [Abstract]  
Allowance for Doubtful Accounts
Analysis of Allowances for Doubtful Accounts:
($ in millions)
 
For the Years Ended December 31,
 
2015
 
2014
 
2013
Allowance for doubtful accounts
 
 
 
 
 
Beginning balance
$
0.3

 
$
0.4

 
$
0.7

Bad debt expense
0.2

 
0.3

 
—

Write-offs and discounts
(0.1
)
 
(0.4
)
 
(0.2
)
Currency translation
—

 
—

 
(0.1
)
Ending balance
$
0.4

 
$
0.3

 
$
0.4
Schedule of Cash Flow, Supplemental Disclosures
Supplemental Cash Flow Information
($ in millions)

 
For the Years Ended December 31,
 
2015
 
2014
 
2013
Interest paid
$
7.8

 
$
6.0

 
$
2.5

Income taxes paid
9.3

 
17.6

 
69.8

 
 
 
 
 
 
 
At December 31,
 
2015
 
2014
 
2013
Capital spending in accounts payable and accrued liabilities
$
2.6

 
$
2.5

 
$
3.6