Stock-Based Incentive Plan (Executed Agreements) (Details) shares in Thousands	9 Months Ended
Sep. 30, 2018 $ / shares shares
Service-based stock appreciation rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares (in shares) \| shares	648
Weighted average grant date fair value (in dollars per share) \| $ / shares	$ 28.13
Service-based restricted stock units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares (in shares) \| shares	255
Weighted average grant date fair value (in dollars per share) \| $ / shares	$ 95.61
Market performance-based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares (in shares) \| shares	43
Weighted average grant date fair value (in dollars per share) \| $ / shares	$ 101.50
Operating performance-based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares (in shares) \| shares	43
Weighted average grant date fair value (in dollars per share) \| $ / shares	$ 89.74

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ 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)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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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.

+ References

No definition available.

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