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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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Stockholders' Equity Note [Abstract]
Shares issued (in shares)	0.1	0.1	0.4	0.7
Proceeds from the exercise of stock options	$ 1.8	$ 1.9	$ 16.0	$ 24.7
Average exercise price per share (in dollars per share)	$ 16.67	$ 35.27	$ 39.20	$ 33.77

X

- Definition

Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

+ References

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=109223946&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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