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, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Stockholders' Equity Note [Abstract]
Shares issued (in shares)	0.2	0.4	1.1	1.5
Proceeds from the exercise of stock options	$ 5.4	$ 7.5	$ 24.1	$ 29.6
Average exercise price per share (in dollars per share)	$ 26.94	$ 17.54	$ 22.55	$ 19.59