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STOCK-BASED COMPENSATION. (Stock Options) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning balance (in shares)	7,388,068
Exercised (in shares)	(3,046,414)
Forfeited (in shares)	(6,874)
Expired (in shares)	(5,724)
Outstanding, ending balance (in shares)	4,329,056	7,388,068
Exercisable at current period-end (in shares)	4,329,056
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted-average exercise price of options outstanding, beginning balance (in dollars per share)	$ 71.06
Weighted-average exercise price of options exercised (in dollars per share)	69.01
Weighted-average exercise price of options forfeited (in dollars per share)	74.48
Weighted-average exercise price of options expired (in dollars per share)	53.22
Weighted-average exercise price of options outstanding, ending balance (in dollars per share)	72.52	$ 71.06
Weighted-average exercise price of options exercisable at current period-end (in dollars per share)	$ 72.52
Weighted-average remaining contractual term in years, outstanding	3 years 1 month 6 days
Weighted-average remaining contractual term in years, exercisable	3 years 1 month 6 days
Total intrinsic value of options exercised	$ 198.3	$ 170.9	$ 208.4
Aggregate intrinsic value of in-the-money options outstanding	341.4
Compensation and related costs | Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Stock-based compensation expense	$ 2.0	$ 5.1	$ 15.3

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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