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STOCK-BASED COMPENSATION. (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Rollforward of stock options
The following table summarizes the status of, and changes in, our stock options during 2019.
 
Options
 
Weighted-
average
exercise
price
 
Weighted-average
remaining
contractual
term in
years
Outstanding at December 31, 2018
11,300,393

 
$
69.05

 
 
Exercised
(3,787,735
)
 
$
64.92

 
 
Forfeited
(116,751
)
 
$
76.69

 
 
Expired
(7,839
)
 
$
59.03

 
 
Outstanding at December 31, 2019
7,388,068

 
$
71.06

 
3.8
Exercisable at December 31, 2019
6,716,511

 
$
70.58

 
3.7
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 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

 
2,120,284

 
$
120.22

Performance-based grants
—

 
84,240

 
$
120.79

Vested (value at vest date was $227.1 million)
(126,885
)
 
(1,741,795
)
 
$
84.18

Nonvested dividend equivalents granted to non-employee directors
—

 
1,808

 
$
111.26

Forfeited
(10,079
)
 
(350,196
)
 
$
87.84

Nonvested at December 31, 2019
7,404

 
6,718,261

 
$
98.75
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 December 31, 2019. Estimated future compensation expense will change to reflect future grants, changes in the probability of performance thresholds being met, and adjustments for actual forfeitures.

(in millions)
 
First quarter 2020
$
59.6

Second quarter 2020
54.5

Third quarter 2020
53.2

Fourth quarter 2020
46.3

Total 2020
213.6

2021 through 2025
198.0

Total
$
411.6