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Condensed Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Condensed Consolidated Statement of Changes in Stockholders' Equity
Issuance of common stock for restricted share awards, shares	508,880
Issuance of common stock for employee stock unit awards, shares	71,610
Issuance of common stock for restricted share awards and employee stock unit awards, tax benefit decrease (in dollars)	$ 3.4
Awards classified to liability for cash settlement, shares	259,840
Issuance of common stock for the employee stock purchase plan, shares	137,782
Shares withheld for net settlements of share-based awards, shares	208,886
Purchase of common stock for treasury, shares	1,770,000

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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