Shareholders' Equity (Common Stock Issued With The Exercise Of Stock Options) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Stockholders' Equity Note [Abstract]
Shares issued (in shares)	0.3	0.6	0.8	0.7
Proceeds from the exercise of stock options	$ 13.6	$ 30.5	$ 42.6	$ 31.5
Average exercise price per share (in dollars per share)	$ 54.27	$ 48.86	$ 51.80	$ 46.37