INCOME TAXES (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020
Income Tax Contingency [Line Items]
Effective income tax rate (as percent)	24.70%	5.00%
Federal and state/provincial statutory rates	26.00%
Gain on equity method transaction	$ 146.9
Release of valuation allowance	(0.4)
Additional accrual	0.3
Tax expense (benefit) related to share-based compensation	(0.4)
Tax expense related to nondeductible transaction costs	0.3
Income tax benefit from CARES Act	9.1
Undistributed foreign earnings	213.4
Canada Revenue Agency \| Pro forma
Income Tax Contingency [Line Items]
Expected tax if earnings were distributed to the U.S.	$ 10.7

Coronavirus Aid, Relief And Economic Security (CARES) Act, Income Tax Expense (Benefit)

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