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STOCK-BASED COMPENSATION. (Stock Options) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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