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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, 2017 | Mar. 31, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Stock options |  |  |  |  |
Stock-based compensation |  |  |  |  |
Weighted-average grant-date fair value of options granted (in dollars per share) | $ 18.97 |  | $ 17.44 | $ 18.01 | $ 16.89
Total intrinsic value of options exercised | $ 8.5 |  | $ 10.9 | $ 40.9 | $ 21.4
Cash received from option exercises | 5.5 |  | $ 4.1 | 19.1 | $ 8.1
Total unrecognized compensation expense related to non-vested shares granted to employees | $ 101.2 |  |  | $ 101.2 |
Cost expected to be recognized over a weighted-average period |  |  |  | 3 years |
Stock units expected to vest (in shares) | 21,157 |  |  | 21,157 |
Restricted stock units |  |  |  |  |
Stock-based compensation |  |  |  |  |
Total unrecognized compensation expense related to non-vested shares granted to employees | $ 20.4 |  |  | $ 20.4 |
Cost expected to be recognized over a weighted-average period |  |  |  | 2 years |
Stock units expected to vest (in shares) | 500 |  |  | 500 |
Number of Shares |  |  |  |  |
Non-vested at the beginning of the period (in shares) |  | 556 |  | 556 |
Granted (in shares) | 23 | 252 |  |  |
Vested (in shares) |  |  |  | (283) |
Forfeited/cancelled (in shares) |  |  |  | (2) |
Non-vested at the end of the period (in shares) | 546 |  |  | 546 |
Weighted Average Grant-Date Fair Value |  |  |  |  |
Non-vested at the beginning of the period (in dollars per share) |  | $ 39.95 |  | $ 39.95 |
Granted (in dollars per share) | $ 50.86 | $ 46.27 | $ 49.65 | 46.65 | $ 44.71
Vested (in dollars per share) |  |  |  | 37.95 |
Forfeited/cancelled (in dollars per share) |  |  |  | 20.69 |
Non-vested at the end of the period (in dollars per share) | $ 44.43 |  |  | $ 44.43 |

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- Definition The aggregate unrecognized cost of equity-based awards made to employees and non-employees under equity-based compensation awards that have yet to vest as of the balance sheet date. + References No definition available. + Details
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- Definition The weighted-average period, over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited or cancelled during the reporting period. + References No definition available. + Details
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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 Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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