Derivative Financial Instruments And Hedging (Notional Amounts Of Derivative Instruments Held) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2010	Mar. 31, 2011	Jun. 30, 2011	Sep. 30, 2010
Raw Materials (Thousands Of Pounds) [Member]
Notional amount of derivatives, non-currency	714,529,000	656,779,000	956,084,000	679,393,000
Natural Gas (Thousands Of MMBTUs) [Member]
Notional amount of derivatives, non-currency	2,075,000	5,130,000	4,620,000	3,200,000
Other Fuel (Thousands Of Gallons) [Member]
Notional amount of derivatives, non-currency	5,668,000	6,445,000	3,937,000	8,001,000
Currency (Thousands Of Dollars) [Member]
Notional amount of derivatives, currency	43,700	22,900	14,100	69,450
Debt (Thousands Of Dollars) [Member]
Notional amount of derivatives, currency			577,500