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Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Target Number of Awards Granted

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No definition available.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Net number of share options (or share units) granted during the period.

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Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options.

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No definition available.

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Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

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No definition available.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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

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Stock-Based Compensation Plans (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants	18,361,915
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Unrecognized compensation cost (stock options less than $1 million)	$ 9,000,000
Weighted average recognition period	1 year 7 months 6 days
Intrinsic value of units outstanding	$ 23,000,000
Intrinsic value of units vested	14,000,000	$ 18,000,000	$ 18,000,000
Fair value of units vested	$ 21,000,000	$ 14,000,000	$ 10,000,000
Shares granted (in shares)	826,546	809,436	685,994
Issued weighted average fair value (in dollars per shares)	$ 17.20	$ 21.15	$ 23.62
Restricted Stock Units \| Directors' Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Shares granted (in shares)	54,855	12,824
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Unrecognized compensation cost (stock options less than $1 million)	$ 0
Shares granted (in shares)	889,599	725,330
Performance Stock Units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target number of awards granted	0.00%
Performance Stock Units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target number of awards granted	200.00%
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost (stock options less than $1 million)	$ 3,000,000
Weighted average recognition period	2 years
Expiration period	10 years
Options exercised	0	0
Granted (in shares)	1,758,760	200,000	0
Stock Options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Stock Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock purchase plan discounted offering price of commons stock	95.00%
Shares purchased under the Employee Stock Purchase Plan	147,680	131,769
Shares reserved for future purchase under the ESPP	2,921,057