Earnings Per Common Share (Impact Of Company's Stock Price On Assuming Dilution Calculation For The Convertible Notes) (Details) (0.875% Convertible Notes Due 2013 [Member], USD $)	12 Months Ended
	Dec. 31, 2012
Share price	$ 50.36
Interest rate	0.875%
$50.36 [Member]
Share price	$ 50.36
Incremental common shares attributable to contingently issuable shares	0
$60.36 [Member]
Share price	$ 60.36
Incremental common shares attributable to contingently issuable shares	1,167,502
$70.36 [Member]
Share price	$ 70.36
Incremental common shares attributable to contingently issuable shares	2,003,400
$80.36 [Member]
Share price	$ 80.36
Incremental common shares attributable to contingently issuable shares	2,631,259
$90.36 [Member]
Share price	$ 90.36
Incremental common shares attributable to contingently issuable shares	3,120,150
$100.36 [Member]
Share price	$ 100.36
Incremental common shares attributable to contingently issuable shares	3,511,614
Warrant Shares [Member] | $50.36 [Member]
Incremental common shares attributable to contingently issuable shares	0
Warrant Shares [Member] | $60.36 [Member]
Incremental common shares attributable to contingently issuable shares	0
Warrant Shares [Member] | $70.36 [Member]
Incremental common shares attributable to contingently issuable shares	0
Warrant Shares [Member] | $80.36 [Member]
Incremental common shares attributable to contingently issuable shares	382,618
Warrant Shares [Member] | $90.36 [Member]
Incremental common shares attributable to contingently issuable shares	1,120,363
Warrant Shares [Member] | $100.36 [Member]
Incremental common shares attributable to contingently issuable shares	1,711,088
Total Treasury Method Incremental Shares [Member] | $50.36 [Member]
Incremental common shares attributable to contingently issuable shares	0	[1]
Total Treasury Method Incremental Shares [Member] | $60.36 [Member]
Incremental common shares attributable to contingently issuable shares	1,167,502	[1]
Total Treasury Method Incremental Shares [Member] | $70.36 [Member]
Incremental common shares attributable to contingently issuable shares	2,003,400	[1]
Total Treasury Method Incremental Shares [Member] | $80.36 [Member]
Incremental common shares attributable to contingently issuable shares	3,013,877	[1]
Total Treasury Method Incremental Shares [Member] | $90.36 [Member]
Incremental common shares attributable to contingently issuable shares	4,240,513	[1]
Total Treasury Method Incremental Shares [Member] | $100.36 [Member]
Incremental common shares attributable to contingently issuable shares	5,222,702	[1]
Shares Due to the Company Under Note Hedges [Member] | $50.36 [Member]
Incremental common shares attributable to contingently issuable shares	0
Shares Due to the Company Under Note Hedges [Member] | $60.36 [Member]
Incremental common shares attributable to contingently issuable shares	1,167,502
Shares Due to the Company Under Note Hedges [Member] | $70.36 [Member]
Incremental common shares attributable to contingently issuable shares	2,003,400
Shares Due to the Company Under Note Hedges [Member] | $80.36 [Member]
Incremental common shares attributable to contingently issuable shares	2,631,259
Shares Due to the Company Under Note Hedges [Member] | $90.36 [Member]
Incremental common shares attributable to contingently issuable shares	3,120,150
Shares Due to the Company Under Note Hedges [Member] | $100.36 [Member]
Incremental common shares attributable to contingently issuable shares	3,511,614
Incremental Shares Issued by the Company upon Conversion [Member] | $50.36 [Member]
Incremental common shares attributable to contingently issuable shares	0	[2]
Incremental Shares Issued by the Company upon Conversion [Member] | $60.36 [Member]
Incremental common shares attributable to contingently issuable shares	0	[2]
Incremental Shares Issued by the Company upon Conversion [Member] | $70.36 [Member]
Incremental common shares attributable to contingently issuable shares	0	[2]
Incremental Shares Issued by the Company upon Conversion [Member] | $80.36 [Member]
Incremental common shares attributable to contingently issuable shares	382,618	[2]
Incremental Shares Issued by the Company upon Conversion [Member] | $90.36 [Member]
Incremental common shares attributable to contingently issuable shares	1,120,363	[2]
Incremental Shares Issued by the Company upon Conversion [Member] | $100.36 [Member]
Incremental common shares attributable to contingently issuable shares	1,711,088	[2]

[1] Represents the number of incremental shares that must be included in the calculation of fully diluted shares under U.S. GAAP.

[2] Represents the number of incremental shares to be issued by the Company upon conversion of the 0.875% Convertible Notes, assuming concurrent settlement of the note hedges and warrants.