Restructuring Activities (Details) (Green River Victorville Facilities [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Green River Victorville Facilities [Member]
Restructuring Cost and Reserve [Line Items]
Company's investment in capital expenditure		$ 11
Expected investment in capital expenditures, total	35
Expected investment in transition expenses	7
Accelerated depreciation expense in cost of sales	0.6	2.3
Transition costs recorded in cost of sales	$ 0.9	$ 1.2