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SHARE-BASED COMPENSATION - RSU Activity (Details) - RSUs $ / shares in Units, shares in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($) $ / shares shares
Number of Shares
Beginning balance (in shares) | shares	0.4
Granted (in shares) | shares	5.8
Vested (in shares) | shares	0.0
Forfeited, expired or canceled (in shares) | shares	(0.2)
Ending balance (in shares) | shares	6.0
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	11.55
Vested, weighted-average grant date fair value (in dollars per shares) | $ / shares	16.88
Forfeited, expired or canceled, weighted-average grant date fair value (in dollars per share) | $ / shares	12.34
Ending balance, weighted-average grant date fair value (in dollars per shares) | $ / shares	$ 11.96
Aggregate Intrinsic Value
Beginning balance | $	$ 6.2
Vested | $	0.4
Ending balance | $	$ 64.6

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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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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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