Additional common stock units for election of deferred annual incentive award, percentage

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- Definition

Amount of annual incentive award payment participant can elect to defer.

+ References

No definition available.

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- Definition

Fraction Of Restricted Stock Award Vesting On Anniversary

+ References

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- Definition

Installments in which restricted stock units vest and are converted to common stock.

+ References

No definition available.

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- Definition

Number Of Anniversaries Of Grant Date Upon Which Restricted Stock Units Vest

+ References

No definition available.

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- Definition

Stock Option Exercise Price As Percentage Of Market Value

+ References

No definition available.

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- Definition

The period in which a stock option can be exercised.

+ References

No definition available.

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- Definition

Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph i

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-Name Accounting Standards Codification

-Topic 718

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-Section 50

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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

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph A240

-Subparagraph h

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- Definition

The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

+ References

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-Paragraph A240

-Subparagraph h

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- Definition

Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph a

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- Definition

Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

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-Paragraph 1

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph c(1)

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

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-Name Accounting Standards Codification

-Topic 230

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Stock-Based Compensation (Narrative) (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercise prices as percentage of the market value on the date of the grant			100.00%
Grant date fair value of options granted			$ 11.40
Compensation expense for stock options	$ 8.9	$ 7.1	$ 9.2	$ 7.4
Exercise of stock options total	0.3		6.2
Number of anniversaries of grant date upon which restricted stock units vest			3
Stock Options Granted Prior To 2006 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period			6 months
Stock options term, years			7
Stock Options Granted in 2010, 2011 and 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period			3 years
Stock options term, years			10
RSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to unvested restricted stock	37.2		37.2
Weighted-average recognition period for unrecognized compensation expense related to unvested restricted stock (years)			2.3
Installments in which restricted stock units vest and are converted to common stock			3
Compensation expense	20.1	12.2	24.9	19.7
LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Portion of restricted stock award vesting on anniversary			0.333
AIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of annual incentive award payment participant can elect to defer.			50.00%
Additional common stock units for election of deferred annual incentive award, percentage			25.00%
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to unvested restricted stock	1.1		1.1
Weighted-average recognition period for unrecognized compensation expense related to unvested restricted stock (years)			0.9
AIP And LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to unvested restricted stock	0.9		0.9
Weighted-average recognition period for unrecognized compensation expense related to unvested restricted stock (years)			1.8
Compensation expense	$ 1.4	$ 1.9	$ 3.1	$ 4.3