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STOCK-BASED COMPENSATION. (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Rollforward of stock options

The following table summarizes the status of, and changes in, our stock options during 2020.

			Options						Weighted- average exercise price						Weighted-average remaining contractual term in years
Outstanding at December 31, 2019			7,388,068						$	71.06
Exercised			(3,046,414)						$	69.01
Forfeited			(6,874)						$	74.48
Expired			(5,724)						$	53.22
Outstanding at December 31, 2020			4,329,056						$	72.52					3.1
Exercisable at December 31, 2020			4,329,056						$	72.52					3.1

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 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						1,780,119						$	151.90
Performance-based grants			—						79,164						$	153.17
Vested (value at vest date was $310.5 million)			(7,404)						(2,096,963)						$	92.14
Nonvested dividend equivalents granted to non-employee directors			—						2,356						$	123.48
Forfeited			—						(115,878)						$	99.76
Nonvested at December 31, 2020			7,412						6,367,059						$	116.51

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, 2020. 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 2021			$	58.3
Second quarter 2021			57.0
Third quarter 2021			56.8
Fourth quarter 2021			50.3
Total 2021			222.4
2022 through 2026			215.1
Total			$	437.5

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure of cost not yet recognized and weighted-average period over which cost is expected to be recognized for nonvested award under share-based payment arrangement.

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