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Shareholders' Equity (Common Stock Issued With The Exercise Of Stock Options) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Stockholders' Equity Note [Abstract]        
Shares issued (in shares) 0.3 0.3 0.9 1.1
Proceeds from the exercise of stock options $ 6.3 $ 6.8 $ 18.8 $ 22.1
Average exercise price per share (in dollars per share) $ 24.96 $ 19.44 $ 21.55 $ 20.39