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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Other Intangible Assets [Abstract] |
Schedule of Goodwill [Table Text Block] | Changes in goodwill and other intangible assets for the year ended December 31, 2018 and 2017 are provided in the following table:
Dollar amounts in millions | 2018 |  | 2017
| Timber and timberlands | Goodwill | Developed Technology | Total |  | Timber and timberlands | Goodwill | Developed Technology | Total
Beginning balance December 31, | $ | 43.9 |  | $ | 16.1 |  | $ | 10.6 |  | $ | 70.6 |  |  | $ | 47.1 |  | $ | 9.7 |  | — |  | $ | 56.8 |
Additions | — |  | — |  | — |  | — |  |  | — |  | 6.4 |  | 11.0 |  | 17.4 |
Amortization | (3.2 | ) | — |  | (0.5 | ) | (3.7 | ) |  | (3.2 | ) | — |  | (0.4 | ) | (3.6 | )
Total goodwill and other intangibles | $ | 40.7 |  | $ | 16.1 |  | $ | 10.1 |  | $ | 66.9 |  |  | $ | 43.9 |  | $ | 16.1 |  | $ | 10.6 |  | $ | 70.6 |
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, |
2019 | $ | 3.8 |
2020 | 3.8 |
2021 | 3.8 |
2022 | 3.8 |
2023 | 3.8 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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