ShareBased Compensation Plans Restricted Stock Units (Details) (Restricted Stock [Member], USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011
Restricted Stock [Member]
Per Share [Abstract]
Unvested Restricted Stock Units Outstanding, Beginning of Period	1,194,000
Restricted Stock Units, Granted	461,458
Restricted Stock Units, Vested	(331,000)
Restricted Stock Units, Forfeited	(131,000)
Unvested Restricted Stock Units Outstanding, End of Period	1,193,000
Weighted Average Grant Date Fair Value [Abstract]
Unvested Restricted Stock Units Outstanding, Beginning Balance	$ 18.29
Restricted Stock Units, Granted in Period, Weighted Average Grant Date Fair Value	$ 16.97
Restricted Stock Units, Vested, Weighted Average Grant Date Fair Value	$ 18.76
Restricted Stock Units, Cancelations, Weighted Average Exercise Price	$ 16.86
Unvested Restricted Stock Units Outstanding Ending Balance	$ 17.74
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	$ 7.8
Unrecognized Compensation Costs Related To Restricted Stock Units	$ 10.4
Total Compensation Cost Not yet Recognized, Period for Recognition (years)	2.6

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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.

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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.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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- Definition

The weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of the plan.

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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

The weighted average fair value at grant date for nonvested equity-based awards issued 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).

+ References

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

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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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.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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- Definition

Value of stock related to Restricted Stock Awards issued during the period, net of the stock value of such awards forfeited.

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

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-Publisher AICPA

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