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Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Other Intangible Assets [Abstract]  
Schedule of Goodwill [Table Text Block]
Changes in goodwill and other intangible assets for the year ended December 31, 2017 and 2016 are provided in the following table:
Dollar amounts in millions
2017
 
2016
 
Timber and timberlands
Goodwill
Developed Technology
Total
 
Timber and timberlands
Goodwill
Total
Beginning balance December 31,
$
47.1

$
9.7

$
—

$
56.8

 
$
50.4

$
9.7

$
60.1

Additions
—

6.4

11.0

$
17.4

 
—

 
—

Amortization
(3.2
)
—

(0.4
)
(3.6
)
 
(3.3
)
—

(3.3
)
Total goodwill and other intangibles
$
43.9

$
16.1

$
10.6

$
70.6

 
$
47.1

$
9.7

$
56.8
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
Amortization of the above intangible assets over the next five years is as follows:
Dollar amounts in millions
 
Year ended December 31,
 
2018
$
3.8

2019
3.8

2020
3.8

2021
3.8

2022
3.8