Summary of Significant Accounting Policies Assets Held for Sale (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2014
Property, Plant and Equipment [Line Items]
Capitalized Interest Costs, Including Allowance for Funds Used During Construction	$ 1.3	$ 1.6	$ (0.2)
Sales Price of held-for-sale assets				11.9
Assets Held-for-sale, Property, Plant and Equipment	59.4	112.2
Accumulated depreciation	50.1	95.9
Net property, plant and equipment	9.3	16.3
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	4.5	6.9
Building [Member]
Property, Plant and Equipment [Line Items]
Assets Held-for-sale, Property, Plant and Equipment	2.9	6.2
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Assets Held-for-sale, Property, Plant and Equipment	$ 52.0	$ 99.1