Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill additions	$ 0.0
Goodwill and other intangible assets	30.0	$ 30.0
Productive Land [Member]
Goodwill [Line Items]
Timber and Timberlands	37.0	38.0
Additions to Timberlands	0.0
Amortization of Intangible Assets	(1.0)
Developed Technology Rights [Member]
Goodwill [Line Items]
Amortization of Intangible Assets	0.0
Additions to finite-lived Intangible Assets	0.0
Finite-Lived Intangible Assets, Net	20.0	20.0
Other Intangible Assets [Member]
Goodwill [Line Items]
Amortization of Intangible Assets	0.0
Additions to finite-lived Intangible Assets	0.0
Finite-Lived Intangible Assets, Net	$ 3.0	$ 3.0