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STOCK-BASED COMPENSATION - Equity Awards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
STOCK-BASED COMPENSATION |  |  |  |  |
Total intrinsic value of options exercised | $ 21.0 |  | $ 25.3 | $ 28.2 | $ 36.2
Stock units expected to vest (in shares) | 14,058 |  |  | 14,058 |
Stock Options |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |
Weighted-average grant-date fair value of options granted (in dollars per share) | $ 26.89 |  |  | $ 25.79 | $ 18.78
Cash received from option exercises | $ 17.7 |  | $ 29.9 | $ 24.5 | $ 43.8
Total unrecognized compensation expense related to non-vested shares granted to employees | $ 68.0 |  |  | $ 68.0 |
Cost expected to be recognized over a weighted-average period |  |  |  | 2 years 4 months 24 days |
Restricted stock units |  |  |  |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |
Granted (in dollars per share) | $ 92.14 |  | $ 71.72 | $ 89.12 | $ 62.78
Restricted Stock Units and Performance Share Units |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |
Total unrecognized compensation expense related to non-vested shares granted to employees | $ 46.4 |  |  | $ 46.4 |
Cost expected to be recognized over a weighted-average period |  |  |  | 2 years 2 months 12 days |
Stock units expected to vest (in shares) | 900 |  |  | 900 |
Number of Shares |  |  |  |  |
Non-vested at the beginning of the period (in shares) |  | 947 |  | 947 |
Granted (in shares) | 14 | 304 |  |  |
Vested (in shares) |  |  |  | (344) |
Forfeited/cancelled (in shares) |  |  |  | (4) |
Non-vested at the end of the period (in shares) | 917 |  |  | 917 |
Weighted Average Grant-Date Fair Value |  |  |  |  |
Non-vested at the beginning of the period (in dollars per share) |  | $ 60.52 |  | $ 60.52 |
Granted (in dollars per share) | $ 92.14 | $ 86.28 |  |  |
Vested (in dollars per share) |  |  |  | 62.27 |
Forfeited/cancelled (in dollars per share) |  |  |  | 60.15 |
Non-vested at the end of the period (in dollars per share) | $ 68.89 |  |  | $ 68.89 |
Performance Share Units |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |
Percentage of Target Performance Level |  |  |  | 100.00% |
Performance Share Units | Maximum |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |
Percentage of Target Performance Level |  |  |  | 200.00% |
Performance Share Units | Minimum |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |
Percentage of Target Performance Level |  |  |  | 0.00% |
Other share-based awards |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |
Total unrecognized compensation expense related to non-vested shares granted to employees | $ 1.6 |  |  | $ 1.6 |
Cost expected to be recognized over a weighted-average period |  |  |  | 1 year 1 month 6 days |

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- Definition The weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect during the reporting period as a result of a forfeiture or cancellation specified in the contractual agreement of the plan. + References No definition available. + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(2)(iii)(2) -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 The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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