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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
	Mar. 31, 2021	Mar. 31, 2020
Stockholders' Equity Note [Abstract]
Shares issued (in shares)	0.4	0.1
Proceeds from the exercise of stock options	$ 21.2	$ 1.0
Average exercise price per share (in dollars per share)	$ 50.57	$ 18.12

X

- Definition

Amount of cash inflow from exercise of option under share-based payment arrangement.

+ References

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-Topic 718
-SubTopic 10
-Section 50
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

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X

- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

+ References

No definition available.

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- Definition

Number of share options (or share units) exercised during the current period.

+ References

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