Summary of Significant Accounting Policies Assets Held for Sale (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Assets Held For Sale Property Plant and Equipment Net	$ 8.2	$ 9.0
Land, land improvements and logging roads, net of road amortization [Member]
Property, Plant and Equipment [Line Items]
Assets Held For Sale Property Plant and Equipment Net	1.3	1.8
Building [Member]
Property, Plant and Equipment [Line Items]
Assets Held For Sale Property Plant and Equipment Net	0.3	0.5
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Assets Held For Sale Property Plant and Equipment Net	$ 6.6	$ 6.7