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STOCK-BASED COMPENSATION. (Stock Options) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at December 31, 2017 (in shares)	15,221,123
Exercised (in shares)	(3,831,062)
Forfeited (in shares)	(73,416)
Expired (in shares)	(16,252)
Outstanding at December 31, 2018 (in shares)	11,300,393	15,221,123
Exercisable at December 31, 2018 (in shares)	9,251,542
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted-average exercise price of options outstanding at December 31, 2017 (in dollars per share)	$ 66.98
Weighted-average exercise price of options exercised (in dollars per share)	60.68
Weighted-average exercise price of options forfeited (in dollars per share)	76.08
Weighted-average exercise price of options expired (in dollars per share)	71.99
Weighted-average exercise price of options outstanding at December 31, 2018 (in dollars per share)	69.05	$ 66.98
Weighted-average exercise price of options exercisable at December 31, 2018 (in dollars per share)	$ 67.39
Weighted-average remaining contractual term in years, outstanding	4 years 6 months
Weighted-average remaining contractual term in years, exercisable	4 years 1 month
Total intrinsic value of options exercised	$ 208.4	$ 293.0	$ 150.5
Aggregate intrinsic value of in-the-money options outstanding	262.9
Aggregate intrinsic value of options exercisable	230.6
Compensation and related costs [Member] | Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Stock-based compensation expense	$ 15.3	$ 28.1	$ 44.9

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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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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Number of options outstanding, including both vested and non-vested options.

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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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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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