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Share-based Compensation (Details) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 25, 2018 | Dec. 31, 2018 USD ($) $ / shares Rate shares | Dec. 31, 2017 USD ($) $ / shares Rate shares | Dec. 31, 2016 USD ($) $ / shares Rate shares | Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Distribution ratio | 0.935301 |  |  |  |
Number of shares of common stock authorized for issuance under the plan (in shares) |  | 30,200,000 |  |  |
Capital shares reserved for future issuance (in shares) |  | 4,900,000 |  |  |
Share-based payment award, expiration period |  | 10 years |  |  |
Share-based compensation expense, after-tax | $ |  | $ 17.7 | $ 13.7 | $ 12.7 |
Tax benefit from compensation expense | $ |  | 4.8 | 7.4 | 7.5 |
Cash related stock options exercises | $ |  | 10.7 | 22.5 | 4.1 |
Excess tax benefits from share-based compensation | $ |  | 3.8 | 2.9 | (0.4) |
Discontinued Operations |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense, after-tax | $ |  | $ 4.0 | 4.4 | 0.0 |
Employee Stock Option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Awards vesting period |  | 3 years |  |  |
Share-based payment award, expiration period |  | 10 years |  |  |
Share-based compensation expense, after-tax | $ |  | $ 4.9 | 4.5 | 4.4 |
Tax benefit from compensation expense | $ |  | $ 1.3 | $ 2.4 | $ 2.6 |
Fair value assumptions, forfeiture rate |  | 4.00% |  |  |
Black Scholes valuation assumptions for stock option grants [Abstract] |  |  |  |  |
Expected dividend yield | Rate |  | 0.77% | 1.15% | 1.77% |
Expected volatility | Rate |  | 26.85% | 27.04% | 26.57% |
Expected life (in years) |  | 6 years 6 months | 6 years 6 months | 6 years 6 months |
Risk-free interest rate | Rate |  | 2.79% | 2.10% | 1.39% |
Stock Option Outstanding (shares) [Roll Forward] |  |  |  |  |
Beginning (in shares) |  | 2,435,000 | 2,749,000 | 2,071,000 |
Granted (in shares) |  | 250,000 | 370,000 | 933,000 |
Exercised (in shares) |  | (260,000) | (590,000) | (171,000) |
Forfeited (in shares) |  | (61,000) | (94,000) | (84,000) |
Ending (in shares) |  | 2,364,000 | 2,435,000 | 2,749,000 | 2,071,000
Options exercisable (in shares) |  | 1,044,000 | 920,000 | 1,292,000 | 1,200,000
Options vested and expected to vest (in shares) |  | 1,287,000 | 1,452,000 | 1,373,000 | 832,000
Options outstanding, weighted-average remaining contractual life (in years) |  | 6 years | 6 years 3 months 18 days | 6 years 1 month 6 days | 5 years 7 months 6 days
Stock Options Outstanding, Weighted Average Exercise Price (dollars per share) [Abstract] |  |  |  |  |
Beginning (in dollars per share) | $ / shares |  | $ 48.37 | $ 45.34 | $ 47.52 |
Granted (in dollars per share) | $ / shares |  | 85.19 | 57.63 | 37.39 |
Exercised (in dollars per share) | $ / shares |  | 41.80 | 39.93 | 25.59 |
Forfeited (in dollars per share) | $ / shares |  | 52.51 | 49.10 | 51.17 |
Ending (in dollars per share) | $ / shares |  | $ 52.87 | $ 48.37 | $ 45.34 | $ 47.52
Options outstanding, aggregate intrinsic value | $ |  | $ 52.5 | $ 112.7 | $ 37.6 | $ 8.7
Options exercised, aggregate intrinsic value | $ |  | $ 11.7 | $ 20.1 | $ 3.5 |
Stock Option Additional Disclosures [Abstract] |  |  |  |  |
Options granted, weighted-average grant-date fair value (in dollars per share) | $ / shares |  | $ 25.70 | $ 15.66 | $ 8.54 |
Options exercisable, intrinsic value | $ |  | $ 19.4 |  |  |
Options exercisable, weighted-average remaining contractual term (in years) |  | 4 years |  |  |
Options exercisable, weighted-average exercise price per share (in dollars per share) | $ / shares |  | $ 55.43 |  |  |
Unrecognized compensation cost | $ |  | $ 5.4 |  |  |
Unrecognized compensation cost, weighted-average period of recognition (in years) |  | 1 year 6 months 21 days |  |  |
Restricted Stock Units (RSUs) related to Directors |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares of common stock credited to directors' accounts for RSUs (in shares) |  | 248,465 | 228,366 |  |
Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Awards vesting period |  | 3 years |  |  |
Share-based compensation expense, after-tax | $ |  | $ 8.4 | $ 6.4 | $ 6.5 |
Tax benefit from compensation expense | $ |  | $ 2.3 | $ 3.5 | $ 3.8 |
Fair value assumptions, forfeiture rate |  | 2.00% |  |  |
Stock Option Additional Disclosures [Abstract] |  |  |  |  |
Unrecognized compensation cost | $ |  | $ 14.0 |  |  |
Unrecognized compensation cost, weighted-average period of recognition (in years) |  | 1 year 7 months 24 days |  |  |
Nonvested Restricted Awards (shares) [Roll Forward] |  |  |  |  |
Nonvested awards, beginning (in shares) |  | 489,000 | 496,000 | 376,000 |
Granted (in shares) |  | 137,000 | 121,000 | 271,000 |
Vested (in shares) |  | (154,000) | (98,000) | (120,000) |
Forfeited (in shares) |  | (13,000) | (30,000) | (31,000) |
Nonvested awards, ending (in shares) |  | 459,000 | 489,000 | 496,000 | 376,000
Nonvested Awards, Weighted Average Grant Date Fair Value (dollars per share) [Abstract] |  |  |  |  |
Nonvested awards, beginning (in dollars per share) | $ / shares |  | $ 47.63 | $ 48.56 | $ 57.36 |
Granted (in dollars per share) | $ / shares |  | 84.94 | 57.66 | 37.44 |
Vested (in dollars per share) | $ / shares |  | 55.14 | 64.75 | 56.12 |
Forfeited (in dollars per share) | $ / shares |  | 65.39 | 47.60 | 52.67 |
Nonvested awards, ending (in dollars per share) | $ / shares |  | $ 55.75 | $ 47.63 | $ 48.56 | $ 57.36
Performance Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense, after-tax | $ |  | $ 4.4 | $ 2.8 | $ 1.8 |
Tax benefit from compensation expense | $ |  | $ 1.2 | $ 1.5 | $ 1.1 |
Nonvested Restricted Awards (shares) [Roll Forward] |  |  |  |  |
Nonvested awards, beginning (in shares) |  | 260,000 | 158,000 | 32,000 |
Granted (in shares) |  | 133,000 | 105,000 | 126,000 |
Vested (in shares) |  | (58,000) | 0 | 0 |
Forfeited (in shares) |  | 0 | (3,000) | 0 |
Nonvested awards, ending (in shares) |  | 335,000 | 260,000 | 158,000 | 32,000
Nonvested Awards, Weighted Average Grant Date Fair Value (dollars per share) [Abstract] |  |  |  |  |
Nonvested awards, beginning (in dollars per share) | $ / shares |  | $ 53.36 | $ 49.55 | $ 81.06 |
Granted (in dollars per share) | $ / shares |  | 88.65 | 66.93 | 41.66 |
Vested (in dollars per share) | $ / shares |  | 81.15 | 0 | 0 |
Forfeited (in dollars per share) | $ / shares |  | 0 | 52.74 | 0 |
Nonvested awards, ending (in dollars per share) | $ / shares |  | $ 56.42 | $ 53.36 | $ 49.55 | $ 81.06

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- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of cash inflow from exercise of option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116856206&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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