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Shareholders' Equity (Common Stock Issued With The Exercise Of Stock Options) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Stockholders' Equity Note [Abstract]        
Shares issued (in shares) 46,817 96,496 678,858 122,757
Proceeds from the exercise of stock options $ 1.3 $ 2.6 $ 22.8 $ 3.2
Average exercise price per share (in dollars per share) $ 28.55 $ 26.93 $ 33.65 $ 26.08