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Per Common Share Information - Additional Information (Detail)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Earnings Per Share Disclosure [Line Items]        
Dilutive effect of share-based compensation 12.1 13.8 12.4 14.0
Stock options that were not included in diluted weighted-average shares 0 0 0 0