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Condensed Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Condensed Consolidated Statement of Changes in Stockholders' Equity
Issuance of common stock for restricted share awards, shares	825,275
Issuance of common stock for stock options, restricted share awards, tax benefit shortfall and award cancellations (in dollars)	$ 0.9
Issuance of common stock for the employee stock purchase plan, shares	68,391
Shares withheld for net settlements of share-based awards, shares	292,878
Purchase of common stock for treasury, shares	748,100

Tax benefit associated with any equity-based compensation plan other than an employee stock ownership plan (ESOP). The tax benefit results from the deduction by the entity on its tax return for an award of stock that exceeds the cumulative compensation cost for common stock or preferred stock recognized for financial reporting. Includes any resulting tax benefit that exceeds the previously recognized deferred tax asset (excess tax benefits).

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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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- Definition

Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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