Long-Term Debt (Schedule Of Revolving Credit Facility) (Details) (USD $)	0 Months Ended													12 Months Ended					0 Months Ended		0 Months Ended		0 Months Ended				3 Months Ended
	Jul. 22, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 0.875% Convertible Notes Due 2013 [Member]	Jul. 22, 2011 0.875% Convertible Notes Due 2013 [Member]	Dec. 31, 2011 Asset Based Revolving Credit Facility [Member]	Dec. 31, 2012 North America [Member] 0.875% Convertible Notes Due 2013 [Member]	Dec. 31, 2011 North America [Member] 0.875% Convertible Notes Due 2013 [Member]	Nov. 30, 2006 North America [Member] 0.875% Convertible Notes Due 2013 [Member]	Dec. 31, 2012 North America [Member] Senior Floating Rate Notes Due 2015 [Member]	Dec. 31, 2011 North America [Member] Senior Floating Rate Notes Due 2015 [Member]	Mar. 21, 2007 North America [Member] Senior Floating Rate Notes Due 2015 [Member]	Jul. 22, 2011 North America [Member] Terminated Credit Facility [Member]	Dec. 31, 2012 North America [Member] Asset Based Revolving Credit Facility [Member]	Dec. 31, 2011 North America [Member] Asset Based Revolving Credit Facility [Member]	Jul. 22, 2011 North America [Member] Asset Based Revolving Credit Facility [Member]	Jul. 22, 2011 UNITED STATES [Member] Asset Based Revolving Credit Facility [Member]	Jul. 22, 2011 CANADA [Member] Asset Based Revolving Credit Facility [Member]	Jul. 22, 2011 Potential Increase Member Asset Based Revolving Credit Facility [Member]	Jul. 22, 2011 Minimum [Member] Asset Based Revolving Credit Facility [Member]	Jul. 22, 2011 Minimum [Member] Asset Based Revolving Credit Facility [Member]	Jul. 22, 2011 Minimum [Member] Potential Increase Member North America [Member] Asset Based Revolving Credit Facility [Member]	Jul. 22, 2011 Maximum [Member] Asset Based Revolving Credit Facility [Member]	Dec. 31, 2012 Parent Company [Member] North America [Member] 0.875% Convertible Notes Due 2013 [Member]	Dec. 31, 2011 Parent Company [Member] North America [Member] 0.875% Convertible Notes Due 2013 [Member]	Dec. 31, 2011 Parent Company [Member] North America [Member] Senior Floating Rate Notes Due 2015 [Member]	Sep. 30, 2011 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Borrowing capacity under credit facility													$ 400,000,000			$ 700,000,000	$ 630,000,000	$ 70,000,000
Debt principal amount					355,000,000				355,000,000			125,000,000												355,000,000.0		125,000,000
Debt maturity date																								2013	2013	2015
Deferred financing costs capitalized						4,800,000
Unamortized fees and expenses																											1,300,000
Threshold for line of credit facility borrowings																				70,000,000
Threshold for line of credit facility percentage of asset based revolving credit facililties																10.00%
Equity interest pledged in all domestic subsidiaries, percentage	100.00%
Equity interest pledged in foreign subsidiaries, percentage																65.00%
Non-voting equity interest pledged in certain foreign subsidiaries, percentage	100.00%
Additional borrowings																			100,000,000
Line of credit facility commitment fee, percentage																					0.375%		0.50%
Outstanding borrowings		1,450,100,000	1,048,900,000	355,000,000			334,600,000	314,400,000						0	34,900,000
Capital expenditures to fixed charges ratio	115.00%
Total credit under facility														700,000,000	400,000,000
Undrawn availability														515,300,000	336,000,000							100,000,000
Interest rate				0.875%			0.875%	0.875%	0.875%	2.70%	3.00%			1.50%	2.90%
Outstanding letters of credit		$ 70,500,000												$ 18,300,000	$ 20,200,000
Original issuance														Jul. 31, 2011	Jul. 31, 2011
Maturity date														Jul. 31, 2017