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Net Income Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Computation Of Basic And Diluted Net Income Per Share

The following table presents the computation of basic and diluted net income per share (in millions, except per share amounts):

	Years Ended December 31,
	2017				2016				2015
Numerator:
Net income	$	660.0			$	735.9			$	588.8
Denominator:
Weighted-average shares outstanding in basic calculation	111.7				114.9				111.3
Add: dilutive effect of potential common shares	4.6				3.0				2.4
Weighted-average shares used in computing diluted net income per share	116.3				117.9				113.7
Net income per share:
Basic	$	5.91			$	6.40			$	5.29
Diluted	$	5.67			$	6.24			$	5.18

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- References

No definition available.

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- Definition

Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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