Stock-Based Compensation Plans (Summary Of Stock Option Activity) (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding, at beginning of period, Number of Shares	2,476,645
Options outstanding, at beginning of period, Weighted-Average Exercise Price (in dollars per share)	$ 28.99
Options granted, Number of Shares	436,043
Options granted, Weighted-Average Exercise Price (in dollars per share)	$ 23.00
Options exercised, Number of Shares	59,521
Options exercised, Weighted-Average Exercise Price (in dollars per share)	$ 17.19
Options forfeited or expired, Number of Shares	156,312
Options forfeited or expired, Weighted-Average Exercise Price (in dollars per share)	$ 29.65
Options outstanding, at end of period, Number of Shares	2,696,855
Options outstanding, at end of period, Weighted-Average Exercise Price (in dollars per share)	$ 28.25
Options exercisable, at end of period, Number of Shares	2,107,489
Options exercisable, at end of period, Weighted-Average Exercise Price (in dollars per share)	$ 29.72
Options expected to vest, at end of period, Number of Shares	540,314
Options expected to vest, at end of period, Weighted-Average Exercise Price (in dollars per share)	$ 22.95