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Long-Term Incentive Employee Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost not yet recognized	$ 21.9
Unrecognized compensation cost weighted-average period	2 years 1 month
Stock option exercised	2,600,000
Proceeds from stock option exercised	40.2
Shares of RS on which restrictions lapsed	0.4
Non Qualified Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted , shares	0.4
Grant date fair value	6.71
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted , shares	0.3
Grant date fair value	22.80
TSR Plan Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted , shares	3.0
Grant date fair value	$ 1.00

X

- Definition

Share-based compensation arrangement by share-based payment award equity instruments other than options grants in period grant date fair value.

+ References

No definition available.

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- Definition

Shares of Rs on which restrictions lapsed.

+ References

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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

+ 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 (i)

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-Number 123R

-Paragraph A240

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

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).

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- Definition

Number of share options (or share units) exercised during the current period.

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Value of stock issued as a result of the exercise of stock options.

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