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Shareholders' Equity Shareholders' Equity (Common Stock Issued With The Exercise Of Stock Options (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Stockholders' Equity Note [Abstract] |  |  |
Shares issued (in shares) | 0.4 | 0.5 | 1.0
Proceeds from the exercise of stock options | $ 12.7 | $ 17.8 | $ 39.7
Average exercise price per share (in dollars per share) | $ 33.87 | $ 35.25 | $ 37.85

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