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GUARANTEES AND CONTINGENCIES - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2021	Dec. 21, 2020
Internal Revenue Service (IRS)
Loss Contingencies [Line Items]
Estimated amount of loss resulting from an adverse tax position			$ 830.0
Income tax examination, tax			430.0
Income tax examination, penalties			130.0
Income tax examination, interest			270.0
Decrease in future withholding taxes					$ (90.0)
IRS settlement charge		$ 299.3
Total outstanding settlement amount		$ 299.3	299.3
Internal Revenue Service (IRS) | Forecast | Domestic
Loss Contingencies [Line Items]
Income taxes paid	$ 287.2
Internal Revenue Service (IRS) | Forecast | State and local jurisdiction
Loss Contingencies [Line Items]
Income taxes paid				$ 12.1
Canada Revenue Agency (CRA)
Loss Contingencies [Line Items]
Estimated amount of loss resulting from an adverse tax position			64.0
Income taxes paid			$ 24.0
Canada Revenue Agency (CRA) | Tax Year 2012
Loss Contingencies [Line Items]
Additional tax expense, as a percent			10.00%
Canada Revenue Agency (CRA) | Tax Year 2013
Loss Contingencies [Line Items]
Additional tax expense, as a percent			10.00%
Canada Revenue Agency (CRA) | Tax Year 2014
Loss Contingencies [Line Items]
Additional tax expense, as a percent			10.00%
Canada Revenue Agency (CRA) | Tax Year 2015
Loss Contingencies [Line Items]
Additional tax expense, as a percent			10.00%
Minimum | Canada Revenue Agency (CRA) | Tax Year 2012
Loss Contingencies [Line Items]
Income tax examination, estimate of increase to taxable income			$ 90.0
Minimum | Canada Revenue Agency (CRA) | Tax Year 2013
Loss Contingencies [Line Items]
Income tax examination, estimate of increase to taxable income			90.0
Minimum | Canada Revenue Agency (CRA) | Tax Year 2014
Loss Contingencies [Line Items]
Income tax examination, estimate of increase to taxable income			90.0
Minimum | Canada Revenue Agency (CRA) | Tax Year 2015
Loss Contingencies [Line Items]
Income tax examination, estimate of increase to taxable income			90.0
Minimum | Canada Revenue Agency (CRA) | Tax Year 2016
Loss Contingencies [Line Items]
Income tax examination, estimate of increase to taxable income			90.0
Maximum | Canada Revenue Agency (CRA) | Tax Year 2012
Loss Contingencies [Line Items]
Income tax examination, estimate of increase to taxable income			100.0
Maximum | Canada Revenue Agency (CRA) | Tax Year 2013
Loss Contingencies [Line Items]
Income tax examination, estimate of increase to taxable income			100.0
Maximum | Canada Revenue Agency (CRA) | Tax Year 2014
Loss Contingencies [Line Items]
Income tax examination, estimate of increase to taxable income			100.0
Maximum | Canada Revenue Agency (CRA) | Tax Year 2015
Loss Contingencies [Line Items]
Income tax examination, estimate of increase to taxable income			100.0
Maximum | Canada Revenue Agency (CRA) | Tax Year 2016
Loss Contingencies [Line Items]
Income tax examination, estimate of increase to taxable income			$ 100.0

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