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Performance Units - Fair Value Assumptions (Details) (Performance Units, USD $)	3 Months Ended
	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award
Weighted-average risk-free interest rate	0.60%
Weighted-average fair value per unit	$ 87.35
Minimum
Share-based Compensation Arrangement by Share-based Payment Award
Expected price volatility range, minimum	24.90%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award
Expected price volatility range, minimum	71.70%

X

- Definition

The weighted average fair value of 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).

+ References

No definition available.

+ Details

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X

- Definition

The weighted average risk-free interest rate assumption used in valuing an option on its own shares.

+ References

No definition available.

+ Details

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X

- Definition

Weighted average expected volatility rate of share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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