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Stock-Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Stock-Based Compensation
Maximum issuance of shares	15,000,000
Maximum issuance of shares	7,500,000
Weighted-average fair value of options granted	$ 18.55	$ 15.88
Total intrinsic value for options exercised	$ 6.9	$ 7.6
Restricted stock units granted	133,971

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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- Definition

Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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