Stock Transactions and Stock-Based Compensation (Components Of Share-Based Compensation Program) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pretax compensation expense	$ 139.0	$ 115.5	$ 109.6
Income tax benefit	(44.6)	(34.0)	(33.2)
Total stock-based compensation expense, net of income taxes	94.4	81.5	76.4
RSUs/PSUs:
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pretax compensation expense	92.2	71.4	64.6
Income tax benefit	(29.6)	(20.8)	(19.4)
Total stock-based compensation expense, net of income taxes	62.6	50.6	45.2
Stock options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pretax compensation expense	46.8	44.1	45.0
Income tax benefit	(15.0)	(13.2)	(13.8)
Total stock-based compensation expense, net of income taxes	$ 31.8	$ 30.9	$ 31.2