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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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Stockholders' Equity Note [Abstract]        
Shares issued 0.1 0.2 0.3 1.1
Proceeds from the exercise of stock options $ 4.6 $ 5.4 $ 7.8 $ 24.1
Average exercise price per share (in dollars per share) $ 35.55 $ 26.94 $ 30.93 $ 22.55