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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |  |
Total remaining unrecognized compensation cost | $ 129.6 |  | $ 129.6 |
Unrecognized compensation cost, recognition period |  |  | 32 months |
Option Awards |  |  |  |
Allocation of stock-based compensation expense |  |  |  |
Options granted (in shares) |  |  | 900 |
Weighted average exercise price of options granted (in dollars per share) |  |  | $ 136.59 |
Average risk-free interest rate | 2.80% | 1.80% | 2.90% | 1.80%
Expected volatility (as a percent) | 29.20% | 33.20% | 29.10% | 33.00%
Restricted Stock Units (RSUs) |  |  |  |
Allocation of stock-based compensation expense |  |  |  |
Non-option equity instruments granted (in shares) |  |  | 300 |
Weighted average grant date fair value of non-option equity units granted (in dollars per share) |  |  | $ 138.03 |
Market Based Restricted Stock Units |  |  |  |
Allocation of stock-based compensation expense |  |  |  |
Non-option equity instruments granted (in shares) |  |  | 42 |
Weighted average grant date fair value of non-option equity units granted (in dollars per share) |  |  | $ 148.69 |
Non-option instruments grants in previous period (in shares) |  |  | 50 |
Non-option equity units performance measurement period |  |  | 3 years |
Average risk-free interest rate |  |  | 2.70% | 1.70%
Expected volatility (as a percent) |  |  | 29.70% | 30.20%
Minimum | Market Based Restricted Stock Units |  |  |  |
Allocation of stock-based compensation expense |  |  |  |
Non-option equity units granted as percentage of target |  |  | 0.00% |
Maximum | Market Based Restricted Stock Units |  |  |  |
Allocation of stock-based compensation expense |  |  |  |
Non-option equity units granted as percentage of target |  |  | 175.00% |

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- Definition Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Previous Period + References No definition available. + Details
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- Definition Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Performance Measurement Period + References No definition available. + Details
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- Definition Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Grants As Percent Of Target + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + 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=109197908&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=109197908&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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