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COMPENSATION ARRANGEMENTS - Restricted Stock and Performance Share Unit Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning balance	1,527,014
Granted (in shares)	1,836,665
Vested (in shares)	(679,944)
Forfeited (in shares)	(830,728)
Ending balance	1,853,007	1,527,014
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-average grant date fair value, beginning balance	$ 74.80
Weighted-average grant date fair value, granted (in usd per share)	24.92	$ 68.80	$ 91.80
Weighted-average grant date fair value, vested (in usd per share)	72.25
Weighted-average grant date fair value, forfeited (in usd per share)	62.48
Weighted-average grant date fair value, ending balance	$ 31.91	$ 74.80
Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning balance	203,853
Granted (in shares)	96,598
Vested (in shares)	(104,441)
Forfeited (in shares)	(71,301)
Ending balance	124,709	203,853
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-average grant date fair value, beginning balance	$ 79.76
Weighted-average grant date fair value, granted (in usd per share)	15.44
Weighted-average grant date fair value, vested (in usd per share)	80.77
Weighted-average grant date fair value, forfeited (in usd per share)	79.91
Weighted-average grant date fair value, ending balance	$ 29.73	$ 79.76
Maximum number of shares issuable (in shares)	173,008
Market-based Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning balance	341,002
Granted (in shares)	0
Vested (in shares)	0
Forfeited (in shares)	(283,334)
Ending balance	57,668	341,002
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-average grant date fair value, beginning balance	$ 60.60
Weighted-average grant date fair value, granted (in usd per share)	0
Weighted-average grant date fair value, vested (in usd per share)	0
Weighted-average grant date fair value, forfeited (in usd per share)	60.60
Weighted-average grant date fair value, ending balance	$ 60.60	$ 60.60
Maximum number of shares issuable (in shares)	57,668

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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 as a result of the occurrence of a terminating event.

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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).

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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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.

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