Stock Transactions And Stock-Based Compensation (Components Of Share-Based Compensation Program) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pretax compensation expense	$ 151.4	$ 139.4	$ 129.8
Income tax benefit	(31.8)	(43.3)	(38.9)
Total stock-based compensation expense, net of income taxes	119.6	96.1	90.9
RSUs/PSUs:
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pretax compensation expense	94.7	90.2	85.9
Income tax benefit	(19.8)	(27.7)	(25.3)
Total stock-based compensation expense, net of income taxes	74.9	62.5	60.6
Stock options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pretax compensation expense	56.7	49.2	43.9
Income tax benefit	(12.0)	(15.6)	(13.6)
Total stock-based compensation expense, net of income taxes	$ 44.7	$ 33.6	$ 30.3