Description of the Business and Summary of Significant Accounting Policies (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2011 month	Dec. 31, 2010	Dec. 31, 2009
Cash and Cash Equivalents
Maximum term of original maturity to classify instruments as cash and cash equivalents (in months)	3
Inventories
Raw materials	$ 609,150,000	$ 589,859,000
Supplies	251,716,000	231,816,000
Work in progress	106,609,000	94,346,000
Finished goods	232,109,000	198,042,000
Total inventories	1,199,584,000	1,114,063,000
Investments
Ownership percentage cost method, maximum	20.00%
Investments	24,900,000	27,100,000
Property, plant and equipment
Property, plant and equipment	3,551,561,000	3,406,626,000
Less accumulated depreciation	1,357,816,000	1,193,293,000
Property, plant and equipment, net	2,193,745,000	2,213,333,000
Depreciation expense	176,500,000	171,700,000	158,900,000
Maximum
Property, plant and equipment
Ownership percentage of equity method investment	50.00%
Minimum
Property, plant and equipment
Ownership percentage of equity method investment	49.00%
Land and improvements
Property, plant and equipment
Property, plant and equipment	271,208,000	257,756,000
Buildings and improvements
Property, plant and equipment
Property, plant and equipment useful life minimum (in years)	10
Property, plant and equipment useful life maximum (in years)	40
Property, plant and equipment	496,976,000	480,434,000
Plant, machinery and equipment
Property, plant and equipment
Property, plant and equipment useful life minimum (in years)	3
Property, plant and equipment useful life maximum (in years)	15
Property, plant and equipment	2,656,358,000	2,571,850,000
Construction in progress
Property, plant and equipment
Property, plant and equipment	$ 127,019,000	$ 96,586,000