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Basis Of Presentation Stock-Based Compensation (Details) - $ / shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2018
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Granted in Period		0.4
Options Granted in Period, Weighted Average Exercise Price		$ 25.35
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non Options Granted in Period		1.1
Non Options Granted in Period, Weighted Average Grant Date Fair Value		$ 25.45
Performance Shares and Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non Options Granted in Period	0.8
Non Options Granted in Period, Weighted Average Grant Date Fair Value			$ 25.04

X

- Definition

The weighted average fair value at grant date for equity-based awards issued during the period on other than stock (or unit) option plans.

+ References

No definition available.

+ Details

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- 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.

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X

- Definition

Net number of non-option equity instruments granted to participants.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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X

- Definition

Gross number of share options (or share units) granted during the period.

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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