Stock-Based Compensation Plans (Summary Of Restricted Stock Units Activity) (Details) (Restricted Stock Units (RSUs) [Member], USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, as of December 31	1,096,910
Granted	8,095
Converted	(848)		0	0
Forfeited	(5,000)
Outstanding, as of December 31	1,099,157	[1]	1,096,910
Vested	680,926
Weighted Average Grant-Date Fair Value Per Share, Outstanding as of December 31	$ 47.88
Weighted Average Grant-Date Fair Value Per Share, Nonvested, Granted	$ 122.81		$ 105.74	$ 63.73
Weighted Average Grant-Date Fair Value Per Share, Nonvested, Converted	$ 106.50
Weighted Average Grant-Date Fair Value Per Share, Nonvested, Forfeited	$ 83.36
Weighted Average Grant-Date Fair Value Per Share, Outstanding as of December 31	$ 48.23	[1]	$ 47.88
Weighted Average Grant-Date Fair Value Per Share, Vested as of December 31	$ 24.87
Aggregate Intrinsic Value, Outstanding	$ 142.9	[1],[2]
Aggregate Intrinsic Value, Vested	$ 88.5	[2]
Weighted Average Remaining Contractual Term, Outstanding	4 years 3 months 18 days	[1]
Weighted Average Remaining Contractual Term, Vested	1 year 7 months 6 days

[1] No RSUs outstanding at December 31, 2013 were convertible to shares of common stock.

[2] The intrinsic value of RSUs is measured by applying the closing stock price as of December 31, 2013 to the applicable number of units.