INCOME TAXES - Summary of Aggregate Changes in Unrecognized Tax benefits (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Change in Unrecognized Tax Positions [Roll Forward]
Unrecognized tax positions, beginning of year	$ 62.7	$ 64.7
Gross increases - tax positions in prior periods		1.2
Gross increases - current period tax positions	2.4	4.6
Settlements	(0.8)	(0.2)
Lapse of statute of limitations	(6.5)	(7.6)
Gross increases (decreases) - tax positions in prior periods	(33.5)
Unrecognized tax positions, end of year	$ 24.3	$ 62.7

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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