Description of the Business and Summary of Significant Accounting Policies (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Inventories
Raw materials	$ 660,384,000	$ 594,388,000
Supplies	293,533,000	278,494,000
Work in progress	84,710,000	82,934,000
Finished goods	276,120,000	246,691,000
Total inventories	1,314,747,000	1,202,507,000
Property, plant and equipment
Property, plant and equipment	3,939,814,000	3,761,759,000
Less accumulated depreciation	1,713,680,000	1,530,561,000
Property, plant and equipment, net	2,226,134,000	2,231,198,000
Depreciation expense	192,400,000	179,900,000	176,500,000
Investments
Investments in short-term commercial paper treated as trading securities	0
Investments	17,800,000	22,700,000
Minimum
Investments
Ownership percentage of equity method investment	49.00%
Maximum
Investments
Ownership percentage of equity method investment	50.00%
Land and improvements
Property, plant and equipment
Property, plant and equipment	293,083,000	288,360,000
Buildings and improvements
Property, plant and equipment
Property, plant and equipment	550,226,000	524,530,000
Buildings and improvements | Minimum
Property, plant and equipment
Property, plant and equipment useful life	10 years
Buildings and improvements | Maximum
Property, plant and equipment
Property, plant and equipment useful life	40 years
Plant, machinery and equipment
Property, plant and equipment
Property, plant and equipment	2,942,684,000	2,810,106,000
Plant, machinery and equipment | Minimum
Property, plant and equipment
Property, plant and equipment useful life	3 years
Plant, machinery and equipment | Maximum
Property, plant and equipment
Property, plant and equipment useful life	15 years
Construction in progress
Property, plant and equipment
Property, plant and equipment	$ 153,821,000	$ 138,763,000