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, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Stockholders' Equity Note [Abstract]
Shares issued	0.1	0.1	0.5	0.1
Proceeds from exercise of stock options	$ 2.7	$ 1.4	$ 10.6	$ 1.7
Average exercise price per share	$ 24.54	$ 17.15	$ 20.59	$ 17.42