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SHARE-BASED COMPENSATION - RSU Activity (Details) - RSUs $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) $ / shares shares
Number of Shares
Beginning balance (in shares) | shares	0.4
Granted (in shares) | shares	0.1
Vested (in shares) | shares	0.0
Forfeited, expired or canceled (in shares) | shares	0.0
Ending balance (in shares) | shares	0.5
Weighted-Average Grant Date Fair Value per Share
Beginning balance, weighted-average grant date fair value (in dollars per shares) | $ / shares	$ 18.41
Granted, weighted-average grant date fair value (in dollars per shares) | $ / shares	16.02
Vested, weighted-average grant date fair value (in dollars per shares) | $ / shares	17.27
Forfeited, expired or canceled, weighted-average grant date fair value (in dollars per share) | $ / shares	21.49
Ending balance, weighted-average grant date fair value (in dollars per shares) | $ / shares	$ 17.75
Aggregate Intrinsic Value
Beginning balance | $	$ 6.2
Vested | $	0.3
Ending balance | $	$ 6.7

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- Definition

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

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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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Intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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