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Compensation Plans - Others (Details) $ / shares in Units, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Feb. 02, 2015 USD ($) $ / shares shares | Feb. 03, 2014 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) item $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2013 USD ($) $ / shares shares
Termination |  |  |  |  |
Deferred compensation cost | $ |  |  | $ 19.0 |  |
Employee Benefit Plan |  |  |  |  |
Matching contribution by Company, maximum percentage of participant's eligible compensation (as a percentage) |  |  | 4.00% |  |
Matching contributions to Employee Benefit Plan | $ |  |  | $ 1.0 | $ 1.0 | $ 1.0
Common Stock Options |  |  |  |  |
Shares Authorized under Stock Option Plan Exercise Price Range |  |  |  |  |
Shares under Options (in shares) | shares |  |  | 1,738,000 |  |
Weighted Average Exercise Price (in dollars per share) |  |  | $ 38.58 |  |
Currently Exercisable - Shares Under Options (in shares) | shares |  |  | 1,368,000 |  |
Currently Exercisable - Weighted Average Exercise Price (in dollars per share) |  |  | $ 37.88 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options Unvested |  |  |  |  |
Unvested at the beginning of the period (in shares) | shares |  |  | 906,000 |  |
Vested (in shares) | shares |  |  | (512,000) |  |
Forfeited (in shares) | shares |  |  | (24,000) |  |
Unvested at the end of the period (in shares) | shares |  |  | 370,000 | 906,000 |
Unvested at the beginning of the period, weighted average grant date fair value (in dollars per share) |  |  | $ 4.85 |  |
Vested, weighted average grant date fair value (in dollars per share) |  |  | 5.06 |  |
Forfeited, weighted average grant date fair value (in dollars per share) |  |  | 4.58 |  |
Unvested at the end of the period, weighted average grant date fair value (in dollars per share) |  |  | $ 4.59 | $ 4.85 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Other Information |  |  |  |  |
Granted (in shares) | shares |  |  | 0 |  |
Granted, weighted average grant date fair value (in dollars per share) |  |  |  | $ 3.80 | $ 5.89
Total vesting date intrinsic values (at vesting) of shares under options vested | $ |  |  | $ 1.0 | $ 7.0 | $ 12.0
Total intrinsic value of vested shares under options at the end of the period | $ |  |  | 5.0 |  |
Proceeds received from options exercised | $ |  |  | 28.0 | 5.0 | 18.0
Total intrinsic value (at exercise) of options exercised | $ |  |  | $ 10.0 | $ 3.0 | $ 25.0
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology |  |  |  |  |
Implied volatility traded option on common stock period |  |  | 30 days |  |
Risk-free rate (as a percent) |  |  |  | 1.34% | 0.78%
Expected life (in years) |  |  |  | 4 years 6 months | 4 years 6 months
Expected volatility (as a percent) |  |  |  | 22.90% | 28.90%
Expected dividend yield (as a percent) |  |  |  | 5.40% | 5.80%
Restricted Stock and Performance Restricted Stock Units |  |  |  |  |
Stock-based awards, vesting period |  |  | 10 years |  |
Restricted Stock and Performance Restricted Stock Units |  |  |  |  |
Restricted Stock and Performance Restricted Stock Units |  |  |  |  |
Performance restricted stock unit is convertible into common stock (in shares) | item |  |  | 1 |  |
Shares withheld to offset tax withholding obligations (in shares) | shares |  |  | 200,000 | 323,000 | 242,000
Unvested restricted stock and performance restricted stock units activity |  |  |  |  |
Weighted-average remaining vesting period of restricted stock and restricted stock units |  |  | 1 year |  |
Total fair values (at vesting) of restricted stock and restricted stock units vested | $ |  |  | $ 21.0 | $ 24.0 | $ 22.0
Restricted stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology |  |  |  |  |
Risk-free rate (as a percent) |  |  | 0.33% | 0.22% |
Expected volatility (as a percent) |  |  | 17.94% | 21.74% |
Expected dividend yield (as a percent) |  |  | 4.79% | 5.61% |
Unvested restricted stock and performance restricted stock units activity |  |  |  |  |
Unvested at the beginning of the period (in shares) | shares |  |  | 112,000 |  |
Vested (in shares) | shares |  |  | (76,000) |  |
Unvested at the end of the period (in shares) | shares |  |  | 36,000 | 112,000 |
Unvested at the beginning of the period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  | $ 38.69 |  |
Vested, Weighted Average Grant Date Fair Value (in dollars per share) |  |  | 37.26 |  |
Unvested at the end of the period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  | $ 41.77 | $ 38.69 |
Restricted Stock Units |  |  |  |  |
Unvested restricted stock and performance restricted stock units activity |  |  |  |  |
Unvested at the beginning of the period (in shares) | shares |  |  | 900,000 |  |
Granted (in shares) | shares |  |  | 402,000 |  |
Vested (in shares) | shares |  |  | (409,000) |  |
Forfeited (in shares) | shares |  |  | (26,000) |  |
Unvested at the end of the period (in shares) | shares |  |  | 867,000 | 900,000 |
Unvested at the beginning of the period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  | $ 40.54 |  |
Granted, Weighted Average Grant Date Fair Value (in dollars per share) |  |  | 48.56 |  |
Vested, Weighted Average Grant Date Fair Value (in dollars per share) |  |  | 44.79 |  |
Forfeited, Weighted Average Grant Date Fair Value (in dollars per share) |  |  | 43.74 |  |
Unvested at the end of the period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  | $ 43.34 | $ 40.54 |
Minimum | Common Stock Options |  |  |  |  |
Restricted Stock and Performance Restricted Stock Units |  |  |  |  |
Stock-based awards, vesting period |  |  | 3 years |  |
Minimum | Restricted Stock and Performance Restricted Stock Units |  |  |  |  |
Restricted Stock and Performance Restricted Stock Units |  |  |  |  |
Stock-based awards, vesting period |  |  | 1 year |  |
Maximum | Common Stock Options |  |  |  |  |
Restricted Stock and Performance Restricted Stock Units |  |  |  |  |
Stock-based awards, vesting period |  |  | 5 years |  |
Maximum | Restricted Stock and Performance Restricted Stock Units |  |  |  |  |
Restricted Stock and Performance Restricted Stock Units |  |  |  |  |
Stock-based awards, vesting period |  |  | 5 years |  |
Former Chairman, Chief Executive Officer and President |  |  |  |  |
Termination |  |  |  |  |
Severance-related charges | $ |  |  | $ 27.0 |  |
Accelerated deferred compensation on termination | $ |  |  | 17.0 |  |
Severance payments and other costs | $ |  |  | $ 10.0 |  |
Three Year LTIP Awards | Minimum |  |  |  |  |
Unvested restricted stock and performance restricted stock units activity |  |  |  |  |
Percentage of performance metrics during performance period |  |  | 0.00% |  |
Three Year LTIP Awards | Maximum |  |  |  |  |
Unvested restricted stock and performance restricted stock units activity |  |  |  |  |
Percentage of performance metrics during performance period |  |  | 200.00% |  |
2006 Incentive Plan |  |  |  |  |
Unvested restricted stock and performance restricted stock units activity |  |  |  |  |
Granted, Weighted Average Grant Date Fair Value (in dollars per share) |  | $ 40.68 |  |  |
Termination |  |  |  |  |
Total share-based compensation expense recognized | $ |  |  | $ 26.0 | $ 22.0 | $ 40.0
Total unrecognized compensation cost, period of recognition |  |  | 3 years |  |
2006 Incentive Plan | Three Year LTIP Awards |  |  |  |  |
Restricted Stock and Performance Restricted Stock Units |  |  |  |  |
Stock-based awards, vesting period |  | 3 years |  |  |
Unvested restricted stock and performance restricted stock units activity |  |  |  |  |
Granted (in shares) | shares |  | 176,088 |  |  |
Total fair values (at vesting) of restricted stock and restricted stock units vested | $ |  | $ 7.2 |  |  |
Weightage Allocated For TSRs Of MSCI US REIT Index |  | 25.00% |  |  |
Weightage Allocated For TSRs Of NAREIT Health Care Index |  | 75.00% |  |  |
2014 Incentive Plan | Three Year LTIP Awards |  |  |  |  |
Unvested restricted stock and performance restricted stock units activity |  |  |  |  |
Granted (in shares) | shares | 128,762 |  |  |  |
Granted, Weighted Average Grant Date Fair Value (in dollars per share) | $ 54.97 |  |  |  |
Total fair values (at vesting) of restricted stock and restricted stock units vested | $ | $ 6.9 |  |  |  |
2014 Incentive Plan | One Year LTIP Award |  |  |  |  |
Unvested restricted stock and performance restricted stock units activity |  |  |  |  |
Granted, Weighted Average Grant Date Fair Value (in dollars per share) | $ 50.82 |  |  |  |
23.34 - 25.52 | Common Stock Options |  |  |  |  |
Shares Authorized under Stock Option Plan Exercise Price Range |  |  |  |  |
Exercise Price Range, Lower Range Limit (in dollars per share) |  |  | $ 23.34 |  |
Exercise Price Range, Upper Range Limit (in dollars per share) |  |  | $ 25.52 |  |
Shares under Options (in shares) | shares |  |  | 166,000 |  |
Weighted Average Exercise Price (in dollars per share) |  |  | $ 23.34 |  |
Weighted Average Remaining Contractual Term |  |  | 2 years 1 month 6 days |  |
Currently Exercisable - Shares Under Options (in shares) | shares |  |  | 166,000 |  |
Currently Exercisable - Weighted Average Exercise Price (in dollars per share) |  |  | $ 23.34 |  |
27.11 - 28.35 | Common Stock Options |  |  |  |  |
Shares Authorized under Stock Option Plan Exercise Price Range |  |  |  |  |
Exercise Price Range, Lower Range Limit (in dollars per share) |  |  | 27.11 |  |
Exercise Price Range, Upper Range Limit (in dollars per share) |  |  | $ 28.35 |  |
Shares under Options (in shares) | shares |  |  | 156,000 |  |
Weighted Average Exercise Price (in dollars per share) |  |  | $ 28.35 |  |
Weighted Average Remaining Contractual Term |  |  | 2 years 9 months 18 days |  |
Currently Exercisable - Shares Under Options (in shares) | shares |  |  | 156,000 |  |
Currently Exercisable - Weighted Average Exercise Price (in dollars per share) |  |  | $ 28.35 |  |
31.95 - 46.92 | Common Stock Options |  |  |  |  |
Shares Authorized under Stock Option Plan Exercise Price Range |  |  |  |  |
Exercise Price Range, Lower Range Limit (in dollars per share) |  |  | 31.95 |  |
Exercise Price Range, Upper Range Limit (in dollars per share) |  |  | $ 46.92 |  |
Shares under Options (in shares) | shares |  |  | 1,416,000 |  |
Weighted Average Exercise Price (in dollars per share) |  |  | $ 41.72 |  |
Weighted Average Remaining Contractual Term |  |  | 4 years 9 months 18 days |  |
Currently Exercisable - Shares Under Options (in shares) | shares |  |  | 1,046,000 |  |
Currently Exercisable - Weighted Average Exercise Price (in dollars per share) |  |  | $ 41.60 |  |

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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of capitalized and expensed compensation cost from equity-based compensation arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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