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Other Operating Credits and Charges, Net (Tables)
 12 Months Ended
Dec. 31, 2017
Other Operating Credits And Charges, Net [Abstract]  
Other Operating Credits and Charges Net [Table Text Block]
The major components of “Other operating credits and charges, net” in the Consolidated Statements of Income for the years ended December 31 are reflected in the table below and described in the paragraphs following the table: 
Dollar amounts in millions
Year ended December 31,
2017
 
2016
 
2015
Contingent consideration fair value adjustment
—

 
—

 
0.2

Adjustments to retirement accounts
(3.1
)
 
—

 
(0.8
)
Refund of sales and use taxes
0.8

 
—

 
—

Loss related to intangible forest license
—

 
—

 
(11.6
)
Loss due to marketing settlement
—

 
—

 
(1.0
)
Loss on workers compensation reserve
(0.9
)
 
—

 
—

Adjustment to product related warranty reserves
(5.4
)
 
(16.9
)
 
1.4

Additions to environmental related contingency reserves and asset retirement obligations
—

 
—

 
(4.6
)
Other
0.6

 
(0.5
)
 
0.1

 
$
(8.0
)

$
(17.4
)

$
(16.3
)
Other operating charges and credits associated with unconsolidated affiliates:
 
 
 
 
 
  Valuation allowance associated with deferred taxes
—

 
—

 
0.7

 
$
—


$
—


$
0.7