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Share-Based Compensation Plans | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-Based Compensation Plans | Share-Based Compensation Plans During 2018, 2017 and 2016, we recognized $27.8, $28.7 and $27.1, respectively, in share-based compensation expense related to stock options, deferred stock, restricted stock and performance share units, all of which is recorded in selling and administrative expenses. Consideration received from share-based awards for 2018, 2017 and 2016 was $5.2, $44.2 and $19.7, respectively. The total income tax benefit recognized related to share-based compensation during 2018, 2017 and 2016 was $4.5, $23.7 and $7.4, respectively. We recognize compensation expense on grants of share-based compensation awards on a straight-line basis over the vesting period of each award. Stock Options All share-based compensation is granted under the 2011 Equity Incentive Plan of Manpower Inc. (“2011 Plan”). Options and stock appreciation rights are granted at a price not less than 100% of the fair market value of the common stock at the date of grant. Generally, options are granted with a ratable vesting period of up to four years and expire ten years from date of grant. No stock appreciation rights had been granted or were outstanding as of December 31, 2018 or 2017. A summary of stock option activity is as follows:
| Shares (000) |  | Wtd. Avg. Exercise Price Per Share |  | Wtd. Avg. Remaining Contractual Term (years) | Aggregate Intrinsic Value (in millions) |
Outstanding, January 1, 2016 | 1,272 |  |  | $64 |  |  |
Granted | 166 |  | 75 |  |  |
Exercised | (279 | ) | 63 |  |  |  | $5 |
Expired or cancelled | (32 | ) | 67 |  |  |
Outstanding, December 31, 2016 | 1,127 |  |  | $66 |  | 4.9 |  | $26 |
Vested or expected to vest, December 31, 2016 | 1,122 |  |  | $66 |  | 4.9 |
Exercisable, December 31, 2016 | 756 |  |  | $62 |  | 3.3 |  | $20 |
Outstanding, January 1, 2017 | 1,127 |  |  | $66 |  |  |
Granted | 145 |  | 97 |  |  |
Exercised | (680 | ) | 64 |  |  |  | $24 |
Expired or cancelled | (18 | ) | 75 |  |  |
Outstanding, December 31, 2017 | 574 |  |  | $77 |  | 7.1 |  | $28 |
Vested or expected to vest, December 31, 2017 | 571 |  |  | $77 |  | 7.1 |
Exercisable, December 31, 2017 | 220 |  |  | $65 |  | 5.3 |  | $14 |
Outstanding, January 1, 2018 | 574 |  |  | $77 |  |  |
Granted | 122 |  | 123 |  |  |
Exercised | (24 | ) | 78 |  |  |  | $1 |
Expired or cancelled | — |  | — |  |  |
Outstanding, December 31, 2018 | 672 |  |  | $85 |  | 5.9 |  | $1 |
Vested or expected to vest, December 31, 2018 | 670 |  |  | $85 |  | 5.9 |
Exercisable, December 31, 2018 | 401 |  |  | $76 |  | 4.5 |  | $1 |
Options outstanding and exercisable as of December 31, 2018 were as follows:
| Options Outstanding |  |  | Options Exercisable |
Exercise Price | Shares (000) |  | Weighted- Average Remaining Contractual Life (years) | Weighted- Average Exercise Price |  |  | Shares (000) |  | Weighted-Average Exercise Price |
$27-$49 | 35 |  | 1.8 |  | $39 |  |  | 35 |  |  | $39 |
$50-$73 | 67 |  | 2.8 | 55 |  |  | 67 |  | 55 |
$74-$85 | 309 |  | 5.8 | 77 |  |  | 223 |  | 77 |
$86-$123 | 261 |  | 7.4 | 109 |  |  | 76 |  | 105 |
| 672 |  | 5.9 |  | $85 |  |  | 401 |  |  | $76 |
We have recognized expense of $4.0, $3.7 and $3.0 related to stock options for the years ended December 31, 2018, 2017 and 2016, respectively. The total fair value of options vested during the same periods was $3.1, $2.3 and $2.5, respectively. As of December 31, 2018, total unrecognized compensation cost was approximately $3.6, net of estimated forfeitures, which we expect to recognize over a weighted-average period of approximately 1.7 years. We estimated the fair value of each stock option on the date of grant using the Black-Scholes option pricing model and the following assumptions:
Year Ended December 31 | 2018 |  | 2017 |  | 2016 |
Average risk-free interest rate | 2.6 | % | 2.0 | % | 1.4 | %
Expected dividend yield | 1.6 | % | 2.0 | % | 2.1 | %
Expected volatility | 27.0 | % | 31.0 | % | 33.0 | %
Expected term (years) | 6.0 |  | 6.0 |  | 6.0 |
The average risk-free interest rate is based on United States Treasury security rates corresponding to the expected term in effect as of the grant date. The expected dividend yield is based on the expected annual dividend as a percentage of the market value of our common stock as of the grant date. We determined expected volatility using a weighted average of daily historical volatility (weighted 75%) of our stock price over the past five years and implied volatility (weighted 25%) based upon exchange traded options for our common stock. We believe that a blend of historical volatility and implied volatility better reflects future market conditions and better indicates expected volatility than considering purely historical volatility. We determined the expected term of the stock options using historical data. The weighted-average grant-date fair value per option granted during the year was $31.46, $25.58 and $19.68 in 2018, 2017 and 2016, respectively. Deferred Stock Our non-employee directors may elect to receive deferred stock in lieu of part or all of their annual cash retainer otherwise payable to them. The number of shares of deferred stock is determined pursuant to a formula set forth in the terms and conditions adopted under the 2011 Plan; the deferred stock is settled in shares of common stock according to these terms and conditions. During December 31, 2018, 2017 and 2016, there were 5,551, 3,647 and 3,714, respectively, shares of deferred stock awarded under this arrangement, all of which are vested. Non-employee directors also receive an annual grant of deferred stock (or restricted stock, if they so elect) as additional compensation for board service. The award vests in equal quarterly installments over one year and the vested portion of the deferred stock is settled in shares of common stock either upon a director’s termination of service or three years after the date of grant (which may in most cases be extended at the directors’ election) in accordance with the terms and conditions under the 2011 Plan. During 2018, 2017 and 2016, there were 10,152, 9,857 and 8,388, respectively, shares of deferred stock and 6,345, 9,792 and 9,966, respectively, shares of restricted stock granted under this arrangement, all of which are vested except for 1,666 shares of restricted stock granted in 2018 that were cancelled. We recognized expense of $1.9, $1.4 and $1.1 related to deferred stock in 2018, 2017 and 2016, respectively. Restricted Stock We grant restricted stock and restricted stock unit awards to certain employees and to non-employee directors who may elect to receive restricted stock rather than deferred stock as described above. Restrictions lapse over periods ranging up to six years, and in some cases upon retirement. We value restricted stock awards at the closing market value of our common stock on the date of grant. A summary of restricted stock activity is as follows:
| Shares (000) |  | Wtd. Avg. Price Per Share |  | Wtd. Avg. Remaining Contractual Term (years) | Aggregate Intrinsic Value (in millions) |
Unvested, January 1, 2016 | 405 |  |  | $64 |  | 1.3 |
Granted | 232 |  | 75 |  |  |
Vested | (172 | ) | 62 |  |  |
Forfeited | (14 | ) | 76 |  |  |
Unvested, December 31, 2016 | 451 |  |  | $70 |  | 1.4 |
Granted | 167 |  |  | $98 |  |  |
Vested | (133 | ) | 79 |  |  |
Forfeited | (37 | ) | 80 |  |  |
Unvested, December 31, 2017 | 448 |  |  | $77 |  | 1.2 |
Granted | 145 |  |  | $119 |  |  |
Vested | (174 | ) | 77 |  |  |
Forfeited | (23 | ) | 89 |  |  |
Unvested, December 31, 2018 | 396 |  |  | $92 |  | 1.3 |  | $26 |
During 2018, 2017 and 2016, we recognized $13.3, $12.3 and $13.8, respectively, of expense related to restricted stock awards. As of December 31, 2018, there was approximately $15.2 of total unrecognized compensation cost related to unvested restricted stock, which we expect to recognize over a weighted-average period of approximately 2.0 years. Performance Share Units Our 2011 Plan allows us to grant performance share units. We grant performance share units typically with a performance period of three years. Vesting of units occurs at the end of the performance period or after a subsequent holding period, except in the case of termination of employment where the units are forfeited immediately. Upon retirement, a prorated number of units vest depending on the period worked from the grant date to retirement date or in certain cases all of the units vest. In the case of death or disability, the units immediately vest at the Target Award level if the death or disability date is during the performance period, or at the level determined by the performance criteria met during the performance period if the death or disability occurs during the subsequent holding period. The units are settled in shares of our common stock. A payout multiple is applied to the units awarded based on the performance criteria determined by the Executive Compensation and Human Resources Committee of the Board of Directors at the time of grant. In the event the performance criteria exceeds the Target Award level, an additional number of shares, up to the Outstanding Award level, may be granted. In the event the performance criteria falls below the Target Award level, a reduced number of shares, as low as the Threshold Award level, may be granted. If the performance criteria falls below the Threshold Award level, no shares will be granted. A summary of the performance share units detail by grant year is as follows:
| 2015 |  | 2016 |  | 2017 |  | 2018 |
Grant Date(s) | February 11, 2015 |  | February 16, 2016 |  | February 9, 2017 |  | February 15, 2018 |
Performance Period (years) | 2015-2017 |  | 2016-2018 |  | 2017-2019 |  | 2018-2020 |
Vesting Date | February 2018 |  | February 2019(a) |  | February 2020(a) |  | February 2021(a) |
Payout Levels (in units): |  |  |  |
Threshold Award | 82,298 |  | 65,141 |  | 57,563 |  | 47,003 |
Target Award | 164,595 |  | 130,282 |  | 115,125 |  | 94,005 |
Outstanding Award | 329,190 |  | 260,564 |  | 230,250 |  | 188,010 |
Shares Issued in 2018 | 219,519 |  | — |  | — |  | — |
Payout Achieved Over Performance Period | — |  | 123,767 |  | — |  | — |
(a) 2016, 2017 and 2018 awards are scheduled to vest in February 2019, 2020, and 2021, respectively, when the Executive Compensation and Human Resources Committee of the Board of Directors determines the achievement of the performance criteria. We recognize and adjust compensation expense based on the likelihood of the performance criteria specified in the award being achieved. The compensation expense is recognized over the performance and holding periods and is recorded in selling and administrative expenses. We have recognized total compensation expense of $8.4, $10.8 and $9.1 in 2018, 2017 and 2016, respectively, related to the performance share units. Other Stock Plans Under the 1990 Employee Stock Purchase Plan, designated employees meeting certain service requirements may purchase shares of our common stock through payroll deductions. These shares may be purchased at their fair market value on a monthly basis. The current plan is non-compensatory according to the accounting guidance on share-based payments. We also maintain the Savings Related Share Option Scheme for United Kingdom employees with at least one year of service. The employees are offered the opportunity to obtain an option for a specified number of shares of common stock at not less than 85% of its market value on the day prior to the offer to participate in the plan. Options vest after either three or five years, but may lapse earlier. Funds used to purchase the shares are accumulated through specified payroll deductions over a 60-month period. We recognized an expense of $0.2, $0.5 and $0.1 for shares purchased under the plan in 2018, 2017 and 2016, respectively. Adoption of New Accounting Guidance on Share-Based Payment Awards As of January 1, 2018, we adopted the new accounting guidance on share-based payment awards. The guidance clarifies when to account for a change to the terms or conditions of a share-based payment award as a modification. Under the guidance, modification accounting is required only if the fair value, vesting conditions or the classification of the award (as equity or liability) changes as a result of the change in terms or conditions. Adoption of this guidance had no impact on our Consolidated Financial Statements.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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