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Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

The following table sets forth the computation of basic and diluted earnings per share:

	Year ended December 31,
Share amounts in millions	2017			2016			2015
Denominator for basic earnings per share:
Weighted average common shares outstanding	144.4			143.4			142.4
Effect of dilutive securities:
Dilutive effect of employee stock plans	2.0			1.7			—
Dilutive effect of stock warrants	—			0.2			—
Dilutive potential common shares	2.0			1.9			—
Denominator for diluted earnings per share:
Adjusted weighted average shares	146.4			145.3			142.4

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ 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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