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Stock Incentive Plans (Tables)
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Summary of Assumptions for Estimating the Fair Value of Stock Options
The following assumptions were utilized in the Black-Scholes option pricing model for estimating the fair value of GCP's stock options granted during the six months ended June 30, 2019:
Six Months Ended June 30,
Assumptions used to calculate expense for stock options:2019
Risk-free interest rate
2.35 - 2.64%
Average life of options (years)
5.5 - 6.5
Volatility
28.02 - 28.59%
Dividend yield—
Weighted average fair value per stock option$8.74
Summary of Stock Option Activity
The following table sets forth information relating to stock options denominated in GCP stock during the six months ended June 30, 2020:
Stock Option ActivityNumber Of
Shares
(in thousands)		Weighted
Average Exercise
Price		Weighted
Average
Remaining Contractual
Term (years)		Aggregated
Intrinsic Value
(in thousands)
Outstanding, December 31, 20191,284  $22.66  3.18$3,171  
Options exercised(40) 18.22  
Options forfeited/expired/canceled(285) 19.88  
Outstanding, June 30, 2020959  $23.67  3.62$522  
Exercisable, June 30, 2020792  $22.92  3.23$522  
Vested and expected to vest, June 30, 2020950  $23.63  3.60$522  
Summary of Restricted Stock Units Award Activity
The following table sets forth the RSU activity for the six months ended June 30, 2020:
RSU ActivityNumber Of
Shares
(in thousands)		Weighted
Average
Grant Date
Fair Value
Outstanding, December 31, 2019156  $27.33  
RSUs settled(48) 28.14  
RSUs forfeited(2) 22.83  
RSUs granted 190  21.11  
RSUs outstanding, June 30, 2020296  $23.16  
Expected to vest as of June 30, 2020276  $23.23  
Schedule of Assumptions for Estimating the Fair Value of PBUs
The following table summarizes the assumptions used in the Monte Carlo simulations for estimating the grant date fair values of PBUs granted during the six months ended June 30, 2020 and 2019:
Six Months Ended June 30,
Assumptions used to calculate expense for PBUs:20202019
Expected Term (Remaining Performance Period)2.852.86
Expected volatility29.85%28.46%
Risk-free interest rate1.21%2.48%
Expected dividends——
Correlation coefficient53.43%54.81%
Median correlation coefficient of constituents54.01%57.09%
Summary of Performance-Based Units Activity
The following table sets forth the PBU activity for the six months ended June 30, 2020:
PBU ActivityNumber Of
Shares
(in thousands)		Weighted
Average
Grant Date
Fair Value
Outstanding, December 31, 2019382  $29.51  
PBU's settled—  —  
PBU's forfeited(114) 28.18  
PBU's granted 146  22.41  
Outstanding, June 30, 2020414  $27.37