Stock Transactions and Stock-Based Compensation (Components Of Share-Based Compensation Program) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pre-tax compensation expense	$ 109.9	$ 95.6	$ 88.1
Income tax benefit	(34.6)	(32.4)	(28.5)
Total stock-based compensation expense, net of income taxes	75.3	63.2	59.6
RSUs and restricted shares:
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pre-tax compensation expense	61.1	47.9	32.2
Income tax benefit	(19.6)	(17.8)	(12.0)
Total stock-based compensation expense, net of income taxes	41.5	30.1	20.2
Stock options:
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pre-tax compensation expense	48.8	47.7	55.9
Income tax benefit	(15.0)	(14.6)	(16.5)
Total stock-based compensation expense, net of income taxes	$ 33.8	$ 33.1	$ 39.4