Stock-Based Compensation (Details Textual) (USD $) In Millions, except Per Share data, unless otherwise specified	6 Months Ended
Jun. 30, 2012
Stock-Based Compensation (Textual) [Abstract]
Stock options exercisable and outstanding	1.1
Stock options exercisable and outstanding, weighted average price	$ 13.37
Stock options exercisable and outstanding, intrinsic value	$ 0.3
Stock options exercisable and outstanding, remaining contractual period	1 year 7 months 6 days
Restricted stock units [Member]
Stock-Based Compensation (Textual) [Abstract]
Restricted stock unit granted	0.5
Weighted average grant date fair values, restricted stock units	$ 17.11
Stock appreciation rights [Member]
Stock-Based Compensation (Textual) [Abstract]
Stock apreciation rights granted	0.4
Weighted average grant date fair values, stock appreciation rights	$ 7.92
Stock appreciation rights outstanding	1.6
Stock appreciation rights, weighted average base value	$ 11.04
Stock appreciation rights, intrinsic value	5.2
Stock appreciation rights, remaining contractual period	5 years
Stock appreciation rights exercisable	0.9
Stock appreciation rights exercisable, weighted-average exercise price	$ 7.02
Stock appreciation rights exercisable, intrinsic value	5.2
Stock appreciation rights exercisable, remaining contractual period	4 years 1 month 6 days
Stock-based benefit plans [Member]
Stock-Based Compensation (Textual) [Abstract]
Compensation cost related to unvested stock-based awards granted	17.0
Estimated forfeitures	$ 6.0
Weighted-average remaining period	1 year 7 months 6 days

Employee service share based compensation nonvested awards estimated forfeitures.

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Restricted stock unit granted.

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Stock options exercisable and outstanding, intrinsic value.

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Stock options exercisable and oustanding.

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Stock options exercisable and outstanding, weighted average price.

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Stock options exercisable and outstanding, remaining contractual period.

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Weighted average grant date fair values, restricted stock unit.

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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

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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

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

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

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Gross number of share options (or share units) granted during the period.

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

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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