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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Description of the Business and Summary of Significant Accounting Policies (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Inventories
Raw materials	$ 764,883,000	$ 660,384,000
Supplies	374,599,000us-gaap_InventorySuppliesNetOfReserves	293,533,000us-gaap_InventorySuppliesNetOfReserves
Work in progress	128,882,000	84,710,000
Finished goods	350,055,000	276,120,000
Total inventories	1,618,419,000us-gaap_InventoryNet	1,314,747,000us-gaap_InventoryNet
Property, plant and equipment
Depreciation expense	229,400,000us-gaap_Depreciation	192,400,000us-gaap_Depreciation	179,900,000us-gaap_Depreciation
Property, plant and equipment	5,010,039,000us-gaap_PropertyPlantAndEquipmentGross	3,939,814,000us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation	1,886,133,000	1,713,680,000
Property, plant and equipment, net	3,123,906,000us-gaap_PropertyPlantAndEquipmentNet	2,226,134,000us-gaap_PropertyPlantAndEquipmentNet
Investments
Investments in short-term commercial paper treated as trading securities	0	0
Investments	18,400,000us-gaap_Investments	17,800,000us-gaap_Investments
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	334,583,000	293,083,000
Buildings and improvements
Property, plant and equipment
Property, plant and equipment	713,837,000	550,226,000
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	3,898,275,000	2,942,684,000
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	20 years
Construction in progress
Property, plant and equipment
Property, plant and equipment	$ 63,344,000	$ 153,821,000