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Stock-Based Compensation | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation |
6. | STOCK-BASED COMPENSATION
The SAIP provides for the granting of various stock awards to eligible employees of JLL. Such awards have historically included restricted stock units and options to purchase a specified number of shares of common stock, although we have not granted stock options since 2003. There were approximately 400 thousand shares available for grant under the SAIP as of December 31, 2017. We also have a stock-based compensation plan for our United Kingdom-based employees, the SAYE plan, that allows for the purchase of stock at a 15% discount from the market price at the beginning of the plan's vesting periods. Stock-based compensation expense is included within Compensation and benefits expense on the Consolidated Statements of Comprehensive Income. Stock-based compensation expense consisted of the following.
| Year Ended December 31,
($ in millions) | 2017 | 2016 | 2015
Restricted stock unit awards | $ | 23.8 |  | 25.5 |  | 20.7 |
SAYE | 1.4 |  | 1.4 |  | 2.1 |
Total | $ | 25.2 |  | 26.9 |  | 22.8 |
Restricted Stock Unit Awards Restricted stock unit activity is presented in the below table.
| Shares (in thousands) |  | Weighted Average Grant Date Fair Value | Weighted Average Remaining Contractual Life (in years)
Unvested as of December 31, 2014 | 745.3 |  |  | $ | 90.43 |  |
Granted | 186.3 |  |  | 159.30 |  |
Vested | (196.4 | ) |  | 78.45 |  |
Forfeited | (29.2 | ) |  | 94.20 |  |
Unvested as of December 31, 2015 | 706.0 |  |  | 111.78 |  | 2.03
Granted | 299.3 |  |  | 107.74 |  |
Vested | (203.6 | ) |  | 96.37 |  |
Forfeited | (50.8 | ) |  | 117.48 |  |
Unvested as of December 31, 2016 | 750.9 |  |  | 113.97 |  | 1.71
Granted | 188.4 |  |  | 119.08 |  |
Vested | (186.5 | ) |  | 99.23 |  |
Forfeited | (25.1 | ) |  | 117.07 |  |
Unvested as of December 31, 2017 | 727.7 |  |  | $ | 118.96 |  | 1.24
We determine the fair value of restricted stock units based on the closing market price of the Company's common stock on the grant date. As of December 31, 2017, we had $23.1 million of unamortized deferred compensation related to unvested restricted stock units, which is anticipated to be recognized over varying periods into 2020. Shares vested during the years ended December 31, 2017, 2016 and 2015, had grant date fair values of $18.5 million, $19.6 million, and $15.4 million, respectively. Shares granted during the years ended December 31, 2017, 2016 and 2015 had grant date fair values of $22.4 million, $32.2 million and $29.7 million, respectively. Other Stock-Based Compensation Programs As previously discussed, we also maintain the SAYE plan, a stock-based compensation plan for our United Kingdom-based employees. There were approximately 240 thousand shares available for grant under the SAYE plan as of December 31, 2017. Options activity under the SAYE plan is presented in the following table.
| Year Ended December 31,
(options in thousands) | 2017 |  | 2016
Options granted | 85 |  |  | — |
Exercise price - options granted | $ | 90.97 |  |  | $ | — |
Options exercised | 28 |  |  | 20 |
Weighted average exercise price | $ | 121.70 |  |  | $ | 70.37 |
The fair values of options granted under the SAYE plan are amortized over their respective vesting periods. There were approximately 133 thousand and 128 thousand options outstanding under the SAYE plan as of December 31, 2017 and 2016, respectively.

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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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