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Supplemental Disclosures (Tables)
 12 Months Ended
Dec. 31, 2016
SUPPLEMENTAL DISCLOSURES [Abstract]  
Allowance for Doubtful Accounts
Analysis of Allowances for Doubtful Accounts:
($ in millions)
 
For the Years Ended December 31,
 
2016
 
2015
 
2014
Allowance for Doubtful Accounts
 
 
 
 
 
Beginning balance
$
0.4

 
$
0.3

 
$
0.4

Bad debt expense
0.4

 
0.2

 
0.3

Write-offs and discounts
—

 
(0.1
)
 
(0.4
)
Currency translation
—

 
—

 
—

Ending balance
$
0.8

 
$
0.4

 
$
0.3
Schedule of Cash Flow, Supplemental Disclosures
Supplemental Cash Flow Information
($ in millions)

 
For the Years Ended December 31,
 
2016
 
2015
 
2014
Interest paid
$
13.3

 
$
7.8

 
$
6.0

Income taxes paid
31.9

 
9.3

 
17.6

Capital spending in accounts payable and accrued liabilities
8.8

 
2.6

 
2.5