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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
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Stockholders' Equity Note [Abstract] |  |  |  |
Shares issued (in shares) | 0.2 | 0.0 | 0.6 | 0.1
Proceeds from the exercise of stock options | $ 7.7 | $ 0.0 | $ 28.9 | $ 1.0
Average exercise price per share (in dollars per share) | $ 51.10 | $ 0 | $ 50.71 | $ 18.12

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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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