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INCOME TAXES (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Income Tax Contingency [Line Items]      
Income tax expense (benefit) $ (16.6) $ (6.0)  
Deferred income tax expense (benefit) 12.0 $ 3.2  
Deferred tax asset related to capital losses 9.8    
Deferred tax assets related to interest expense limitation $ 0.9    
Fees and other income     $ 2.5
Percentage of applicable cash saving in income tax distributable to specified unitholders 85.00%    
Percentage of applicable cash saving in income tax available for the entity 15.00%    
Other assets      
Income Tax Contingency [Line Items]      
Deferred tax liabilities $ (14.2)   (2.1)
Accrued Liabilities      
Income Tax Contingency [Line Items]      
Liability for unrecognized tax benefits for uncertain income tax positions     $ 0.2
Amount Payable Pursuant to Tax Receivable Agreement      
Income Tax Contingency [Line Items]      
Amount payable pursuant to tax receivable agreement $ 1.6