Other Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill, Impairment Loss	$ 0.0
Goodwill and Intangible Asset Impairment	0.0	$ (11.6)
Timber and Timberlands	47.1	50.4	$ 64.9
Goodwill	9.7	9.7	9.7
Intangible Assets, Net (Including Goodwill)	56.8	60.1	$ 74.6
Future Amortization Expense, Year One	3.2
Future Amortization Expense, Year Two	3.2
Future Amortization Expense, Year Three	3.2
Future Amortization Expense, Year Four	3.2
Future Amortization Expense, Year Five	3.2
Goodwill		0.0
Amortization of Intangible Assets	(3.3)	(2.9)
Impairment of Intangible Assets, Finite-lived	0.0	$ (11.6)
Timber licenses
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 91.3