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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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