Stock Transactions And Stock-Based Compensation (Components Of Share-Based Compensation Program) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pretax compensation expense	$ 158.8	$ 138.1	$ 127.1
Income tax benefit	(32.9)	(28.4)	(39.2)
Total stock-based compensation expense, net of income taxes	125.9	109.7	87.9
RSUs/PSUs
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pretax compensation expense	97.3	86.5	82.6
Income tax benefit	(20.1)	(17.7)	(25.2)
Total stock-based compensation expense, net of income taxes	77.2	68.8	57.4
Stock options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pretax compensation expense	61.5	51.6	44.5
Income tax benefit	(12.8)	(10.7)	(14.0)
Total stock-based compensation expense, net of income taxes	$ 48.7	$ 40.9	$ 30.5