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GUARANTEES AND CONTINGENCIES - Additional Information (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Dec. 31, 2020	Jun. 30, 2021
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
IRS settlement charge		$ 300.5
Income taxes paid		299.6
Decrease in future withholding taxes		90.0
Internal Revenue Service (IRS) | Domestic
Loss Contingencies [Line Items]
Income taxes paid		288.6
Internal Revenue Service (IRS) | State and local jurisdiction
Loss Contingencies [Line Items]
Income taxes paid		11.0
Canada Revenue Agency (CRA)
Loss Contingencies [Line Items]
Estimated amount of loss resulting from an adverse tax position		74.0
Income taxes paid		$ 28.0
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%
Canada Revenue Agency (CRA) | Tax Year 2016
Loss Contingencies [Line Items]
Additional tax expense, as a percent		10.00%
Canada Revenue Agency (CRA) | Tax Year 2017
Loss Contingencies [Line Items]
Estimated amount of loss resulting from an adverse tax position		$ 470.0
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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