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STOCK-BASED COMPENSATION. (Tables)
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Rollforward of stock options
The following table summarizes the status of, and changes in, our stock options during the six months ended June 30, 2020.
 
Options
 
Weighted-
average
exercise
price
Outstanding at December 31, 2019
7,388,068

 
$
71.06

Exercised
(1,944,942
)
 
$
68.29

Forfeited
(5,457
)
 
$
74.09

Outstanding at June 30, 2020
5,437,669

 
$
72.05

Exercisable at June 30, 2020
4,772,891

 
$
71.52
Rollforward of nonvested restricted shares and restricted stock units
The following table summarizes the status of, and changes in, our nonvested restricted shares and restricted stock units during the six months ended June 30, 2020.
 
Restricted
shares
 
Restricted
stock
units
 
Weighted-average
fair value
Nonvested at December 31, 2019
7,404

 
6,718,261

 
$
98.75

Time-based grants
7,412

 
39,925

 
$
116.08

Dividend equivalents granted to non-employee directors
—

 
1,243

 
$
110.74

Vested
(7,404
)
 
(87,021
)
 
$
97.44

Forfeited
—

 
(67,294
)
 
$
96.82

Nonvested at June 30, 2020
7,412

 
6,605,114

 
$
98.91
Future stock-based compensation expense
The following table presents the compensation expense to be recognized over the remaining vesting periods of the stock-based awards outstanding at June 30, 2020. Estimated future compensation expense will change to reflect future grants of restricted stock awards and units, future option grants, changes in the probability of performance thresholds being met, and adjustments for actual forfeitures.
 
(in millions)
 
Third quarter 2020
$
53.6

Fourth quarter 2020
46.7

2021
108.7

2022 through 2026
90.0

Total
$
299.0