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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Stockholders' Equity Note [Abstract]        
Shares issued (in shares) 90,248 42,092 101,475 301,167
Proceeds from the exercise of stock options $ 2.9 $ 0.9 $ 3.2 $ 14.2
Average exercise price per share (in dollars per share) $ 31.76 $ 22.50 $ 31.11 $ 47.14