Capital Stock and Share Based Compensation Plans - Summary of stock option transactions (Details) (USD $)	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding and Exercisable [Roll Forward]
Options outstanding at beginning of period, number of shares	8,011,380	10,094,622	10,502,083
Options exercised in period, number of shares	(4,635,148)	(2,046,309)	(311,933)
Options forfeited in period, number of shares	(6,184)	(36,933)	(95,528)
Options outstanding at end of period, number of shares		8,011,380	10,094,622
Options exercisable, number of shares	3,370,048	8,011,380	10,094,622
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding and Exercisable, Weighted Average Exercise Price [Roll Forward]
Options outstanding at beginning of period, weighted-average exercise price (USD per share)	$ 9.77	$ 9.62	$ 9.57
Options exercised in period, weighted-average exercise price (USD per share)	$ 10.00	$ 9.03	$ 8.01
Options forfeited in period, weighted-average exercise price (USD per share)	$ 10.23	$ 9.12	$ 9.53
Options outstanding at end of period, weighted-average exercise price (USD per share)	$ 9.46	$ 9.77	$ 9.62
Options Exercisable, Weighted Average Exercise Price (USD per share)	$ 9.46	$ 9.77	$ 9.62
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding and Exercisable, Exercise Price Range [Roll Forward]
Options outstanding at beginning of period, lower end of range of exercise price range (USD per share)	$ 7	$ 7	$ 6
Options outstanding at beginning of period, upper end of range of exercise price range (USD per share)	$ 11	$ 11	$ 11
Options exercised, lower end of exercise price range (USD per share)	$ 7	$ 8	$ 6
Options exercised, upper end of exercise price range (USD per share)	$ 11	$ 10	$ 10
Options forfeited, lower end of exercise price range (USD per share)	$ 9	$ 8	$ 7
Options forfeited, upper end of exercise price range (USD per share)	$ 11	$ 11	$ 11
Options outstanding at end of period, lower end of range of exercise price range (USD per share)	$ 7	$ 7	$ 7
Options outstanding at end of period, upper end of range of exercise price range (USD per share)	$ 11	$ 11	$ 11
Options exercisable, lower end of exercise price range (USD per share)	$ 7	$ 7	$ 7
Options exercisable, upper end of exercise price range	$ 11	$ 11	$ 11

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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 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 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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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of share options (or share units) exercised during the current period.

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