Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2012

Changes in outstanding share option awards are as follows:



	2012			2011			2010
Millions of shares, except prices	Options		Weighted Average Exercise Price (£ Sterling)	Options		Weighted Average Exercise Price (£ Sterling)	Options		Weighted Average Exercise Price (£ Sterling)
Outstanding at the beginning of year	4.5		7.85	10.7		13.85	16.4		14.99
Forfeited during the year	(0.2	)	14.80	(5.3	)	19.70	(3.9	)	21.90
Exercised during the year	(1.7	)	8.08	(0.9	)	8.33	(1.8	)	6.70
Outstanding at the end of the year	2.6		7.31	4.5		7.85	10.7		13.85
Exercisable at the end of the year	2.6		7.31	4.5		7.85	10.7		13.85

Employee Stock Purchase Plan (ESPP)

During 2012, the company established a nonqualified, broad-based ESPP for all eligible employees. Employees may purchase shares of our common stock generally in annual intervals at 85% of fair market value. Employee ESPP contributions may not exceed $6,000 per offering period. Upon the exercise of share options, the company either issues new shares or can utilize shares held in treasury (see Note 10, "Share Capital") to satisfy the exercise. For the year ended December 31, 2012, the company recognized $0.3 million in compensation expense related to the employee stock purchase plan.

United States of America, Dollars

Movements Of Share Awards

Movements on share awards priced in U.S. dollars are detailed below:



	Year ended December 31, 2012				Year ended December 31, 2011				Year ended December 31, 2010
	Time-Vested		Performance-Vested	Weighted Average Grant Date Fair Value ($)	Time-Vested		Performance-Vested	Weighted Average Grant Date Fair Value ($)	Time-Vested		Weighted Average Grant Date Fair Value ($)
Millions of shares, except fair values
Unvested at the beginning of period	17.3		—	20.34	17.4		—	17.25	11.6		15.24
Granted during the period	5.5		0.3	24.84	5.9		—	26.34	10.6		19.11
Forfeited during the period	(0.4	)	—	21.43	(0.4	)	—	19.65	(0.3	)	19.36
Vested and distributed during the period	(5.9	)	—	18.96	(5.6	)	—	18.68	(4.5	)	16.04
Unvested at the end of the period	16.5		0.3	22.36	17.3		—	20.34	17.4		17.25

United Kingdom, Pounds

Movements Of Share Awards

- 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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