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GUARANTEES AND CONTINGENCIES - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2021
Mar. 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  
IRS settlement charge $ 1.3 300.6  
Income taxes paid 290.0    
Total outstanding settlement amount 10.6 10.6  
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 $ 1.4    
Canada Revenue Agency (CRA)      
Loss Contingencies [Line Items]      
Estimated amount of loss resulting from an adverse tax position   64.0  
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