Shareholders' Equity (Common Stock Issued With The Exercise Of Stock Options) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Stockholders' Equity Note [Abstract]
Shares issued	0.1	0.4	0.1	2.3
Proceeds from exercise of stock options	$ 1.4	$ 8.0	$ 1.7	$ 39.9
Average exercise price per share	$ 17.15	$ 17.81	$ 17.42	$ 17.05