Stock-based Compensation Stock-based Compensation (Details textual) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012 Years	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Unrecognized stock-based compensation costs, net of estimated forfeitures	$ 44.4		$ 44.4
Weighted average period of unrecognized stock-based compensation costs, net of estimated forfeitures	2.1
Cash received from the exercise of stock options	1.5	0.8	3.1	11.1
Related tax benefit realized from the exercise of the stock options	$ 0.8	$ 0.6	$ 0.1	$ 4.7
Restricted stock unit
Awards granted			1,781,000
Weighted average grant date fair value per share	$ 19.84	$ 27.43	$ 17.23	$ 34.41
Vesting period for market-based RSUs			3 years
Time-vested restricted stock unit
Awards granted	6,000	6,000	984,000	630,000
Weighted average grant date fair value per share	$ 19.84	$ 27.43	$ 21.67	$ 34.41
Market-based restricted stock unit
Awards granted			795,000
Weighted average grant date fair value per share			$ 11.73
Employee Stock Purchase Plan
Weighted average grant date fair value per share	$ 0.00	$ 0.00	$ 5.02	$ 7.36
Number of common stock shares issued	208,383
Shares of common stock reserved for future issuance under all of the stock incentive plans	4,072,134		4,072,134

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.

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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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- 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.

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- Definition

Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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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).

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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).

+ References

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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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(c)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

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-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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