Share-based compensation plans (Tables)

9 Months Ended

Sep. 30, 2011

Share-based compensation plans [Abstract]

Fair value of options calculation assumptions [Table Text Block]

				Three Months
				Ended September 30,
Options Granted				2011			2010

Number of shares underlying options, in thousands						290			367
Weighted-average exercise price per share			$			31.47			19.05

Assumptions used to estimate fair value
	Expected dividend yield (a):
		Weighted-average				1.3%			2.1%
		Range				1.3%			2.1%
	Expected volatility (b):
		Weighted-average				36%			36%
		Range		36%	–	37%	35%	–	39%
	Risk-free interest rate (c):
		Weighted-average				1.2%			1.4%
		Range		0.5%	–	1.9%	0.6%	–	1.9%
	Expected term in years (d):
		Weighted-average				3.8			3.8
		Range		1.9	–	5.3	1.9	–	5.3

Weighted-average fair value estimates at grant date:
	In millions		$			2.4			1.7
	Fair value per share		$			8.17			4.65

Nonvested share activity [Table Text Block]

Nonvested Share Activity
	Number of Shares				Weighted-Average
	2005	Directors’			Grant-Date
(in thousands of shares, except per share amounts)	Plan	Plan	Total		Fair Value (a)

Balance as of December 31, 2010	299.5	29.1	328.6	$	22.84
Granted	143.7	15.8	159.5		30.43
Cancelled awards	(14.9)	-	(14.9)		23.40
Vested	(120.6)	(29.1)	(149.7)		24.07
Balance as of September 30, 2011	307.7	15.8	323.5	$	25.99

- Definition

Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

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