Assets Held for Sale (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Proceeds from sales of assets	$ 0.2	$ 0.3	$ 9.1	$ 0.3
Property, plant and equipment held for sale [Abstract]
Assets held-for-sale, property, plant and equipment	197.1		197.1		214.3
Assets held for sale acumulated depreciation	(153.6)		(153.6)		(162.4)
Assets Held For Sale Property Plant and Equipment Net	43.5		43.5		51.9
Land Land Improvements And Logging Roads Net of Road Amortization [Member]
Property, plant and equipment held for sale [Abstract]
Assets held-for-sale, property, plant and equipment	10.0		10.0		13.1
Building [Member]
Property, Plant and Equipment [Line Items]
Proceeds from sales of assets			8.5
Property, plant and equipment held for sale [Abstract]
Assets held-for-sale, property, plant and equipment	17.1		17.1		22.9
Machinery and Equipment [Member]
Property, plant and equipment held for sale [Abstract]
Assets held-for-sale, property, plant and equipment	$ 170.0		$ 170.0		$ 178.3