Stock-Based Compensation (Restricted Stock Units and PBRSU) (Details) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended
Jun. 30, 2012
Weighted Average Grant Date Fair Value
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 8.0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Term	2.2
Restricted Stock [Member]
Number of Shares
Outstanding, Beginning of Period	1,193,000
Granted	718,000
Vested	(409,000)
Forfeited	(40,000)
Outstanding, End of Period	1,462,000
Weighted Average Grant Date Fair Value
Weighted Average Grant Date Fair Value, Beginning Balance	$ 17.74
Granted in Period, Weighted Average Grant Date Fair Value	$ 16.58
Vested, Weighted Average Grant Date Fair Value	$ 18.21
Forfeited, Weighted Average Exercise Price	$ 16.46
Weighted Average Grant Date Fair Value, Ending Balance	$ 17.07
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	11.9
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	16.8
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Term	2.4
PBRSU [Member]
Number of Shares
Outstanding, Beginning of Period	988,000
Granted	345,000
Vested	(103,000)
Forfeited	(41,000)
Outstanding, End of Period	1,189,000
Weighted Average Grant Date Fair Value
Weighted Average Grant Date Fair Value, Beginning Balance	$ 17.71
Granted in Period, Weighted Average Grant Date Fair Value	$ 16.05
Vested, Weighted Average Grant Date Fair Value	$ 17.76
Forfeited, Weighted Average Exercise Price	$ 17.92
Weighted Average Grant Date Fair Value, Ending Balance	$ 17.22
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	5.5
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 15.3
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Term	2.2

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

-Publisher FASB

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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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