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Goodwill and Other Intangible Assets Other Intangible Assets (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]
Timber and Timberlands	$ 40,000,000	$ 41,000,000
Goodwill	26,000,000	16,100,000
Goodwill and other intangible assets	47,800,000	26,200,000
Additions to Timberlands	0
Goodwill additions	10,000,000
Amortization of Intangible Assets	1,000,000
Developed Technology Rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	22,000,000	10,000,000
Additions to finite-lived Intangible Assets	12,000,000
Amortization of Intangible Assets	0
Other Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	3,000,000	$ 0
Additions to finite-lived Intangible Assets	3,000,000
Amortization of Intangible Assets	$ 0

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Carrying amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance.

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The cash outflow for acquisition of timber and timberlands during the period.

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Amount before accumulated depreciation and depletion of forest crops and land devoted primarily to the growth and harvest of forest crops for commercial purposes.

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