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STOCK-BASED COMPENSATION. (Tables)
 9 Months Ended
Sep. 30, 2019
Share-based Payment Arrangement [Abstract]  
Rollforward of stock options
The following table summarizes the status of, and changes in, our stock options during the nine months ended September 30, 2019.  
 
Options
 
Weighted-
average
exercise
price
Outstanding at December 31, 2018
11,300,393

 
$
69.05

Exercised
(2,847,972
)
 
$
63.58

Forfeited
(114,822
)
 
$
76.70

Expired
(7,839
)
 
$
59.03

Outstanding at September 30, 2019
8,329,760

 
$
70.83

Exercisable at September 30, 2019
6,410,125

 
$
69.12
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 nine months ended September 30, 2019.
 
Restricted
shares
 
Restricted
stock
units
 
Weighted-average
fair value
Nonvested at December 31, 2018
136,964

 
6,603,920

 
$
87.07

Time-based grants
7,404

 
55,872

 
$
103.45

Vested
(9,670
)
 
(83,280
)
 
$
90.52

Forfeited
(9,619
)
 
(327,279
)
 
$
87.79

Nonvested at September 30, 2019
125,079

 
6,249,233

 
$
87.15
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 September 30, 2019. 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)
 
Fourth quarter 2019
$
43.6

2020
100.6

2021 through 2024
80.6

Total
$
224.8