Goodwill And Other Intangible Assets (Schedule Of Change In Net Carrying Amount Of Goodwill By Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			3 Months Ended
	Mar. 31, 2012	Mar. 31, 2012 Steel Mills [Member]	Dec. 31, 2011 Steel Mills [Member]	Mar. 31, 2012 Steel Products [Member]	Mar. 31, 2012 Raw Materials [Member]	Mar. 31, 2012 All Other [Member]	Dec. 31, 2011 All Other [Member]
Goodwill [Line Items]
Balance, beginning of period	$ 1,830,661	$ 268,466	$ 268,466	$ 790,441	$ 682,902	$ 88,852	$ 88,852
Acquisitions	11,477				11,477
Translation	13,833			13,833
Balance, end of period	$ 1,855,971	$ 268,466	$ 268,466	$ 804,274	$ 694,379	$ 88,852	$ 88,852