The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The period of time a share-based award is expected to be outstanding. A share-based award's expected term shall be determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior. An entity is required to aggregate individual awards into relatively homogeneous groups.

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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section D
-Subsection 2

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The estimated measure of the percentage amount by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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For each plan, identification of the award pricing model or other valuation method used in calculating the weighted average fair values disclosed. The model is also used to calculate the compensation expense that is shown within the balance sheet, income statement, and cash flow. Examples of valuation techniques are lattice models (binomial model), closed-form models (Black-Scholes-Merton formula), and a Monte Carlo simulation technique. Fair value is the amount at which an asset (or liability) could be bought (or incurred) or sold (or settled) in a current transaction between willing parties, that is, other than in a forced or liquidation sale. May include disclosures about the assumptions underlying application of the method selected.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The number of shares into which fully or partially vested stock options outstanding as of the balance-sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The decrease in the number of reserved shares that could potentially be issued attributable to the exercise or conversion during the reporting period of previously issued stock options under the option plan.

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The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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The weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated during the reporting period due to noncompliance with plan terms during the reporting period.

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The quantity of shares issuable on stock options awarded under the plan during the reporting period.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance-sheet date, including vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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STOCK-BASED COMPENSATION (Details)	3 Months Ended		6 Months Ended
STOCK-BASED COMPENSATION (Details)	Jun. 30, 2011 CAD	Jun. 30, 2010 CAD	Jun. 30, 2011 CAD	Jun. 30, 2010 CAD	Jun. 30, 2011 Stock options CAD	Jun. 30, 2010 Stock options
Stock options activity
Options outstanding, beginning of year (in shares)					6,762,704
Options granted (in shares)	19,000	40,000	2,593,785	2,795,080	2,593,785
Options exercised (in shares)	(53,169)	(226,048)	(217,388)	(285,373)	(217,388)
Options cancelled (in shares)	0	(42,500)	(91,750)	(53,050)	(91,750)
Options outstanding, end of year (in shares)	9,047,351		9,047,351		9,047,351
Options exercisable at end of period (in shares)					5,518,997
Weighted average exercise price
Outstanding, beginning of year, weighted average exercise price (in Canadian dollars per share)					56.94
Granted, weighted average exercise price (in Canadian dollars per share)	63.39	63.70	76.46	57.05	76.46
Exercised, weighted average exercise price (in Canadian dollars per share)					40.46
Cancelled, weighted average exercise price (in Canadian dollars per share)					66.87
Outstanding, end of year, weighted average exercise price (in Canadian dollars per share)					62.83
Options exercisable at end of period (in Canadian dollars per share)					58.94
Fair value of options weighted average assumptions:
Pricing model used for valuation of options					Black Scholes	Black Scholes
Risk-free interest rate (as a percent)					1.96%	1.87%
Expected life of options (in years)					2.5	2.5
Expected volatility of the Company's share price (as a percent)					34.60%	44.30%
Expected dividend yield (as a percent)					0.88%	0.43%