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SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS Narrative (Details) - Series D Preferred Limited Partner [Member] - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Class of Stock [Line Items]    
Required amount of per unit cash dividends to permit dividend paid in kind   $ 0.635
Preferred Stock, Distributions, Period - June 29, 2018 to June 28, 2020 [Member]    
Class of Stock [Line Items]    
Preferred units distribution percentage, per annum   9.75%
Preferred units, distribution rate, per annum   $ 57.6
Preferred stock, dividend amount, per unit, per distribution period   $ 0.619
Preferred Stock, Distributions, Period - June 29, 2020 to June 28, 2023 [Member]    
Class of Stock [Line Items]    
Preferred units distribution percentage, per annum   10.75%
Preferred units, distribution rate, per annum   $ 63.4
Preferred stock, dividend amount, per unit, per distribution period   $ 0.682
Preferred Stock, Distributions, Period - June 29, 2023 and thereafter [Member]    
Class of Stock [Line Items]    
Preferred units, dividend payment rate, variable   the greater of 13.75%, or $81.1 million, per annum ($0.872 per unit per distribution period) or the distribution per common unit thereafter
Preferred Stock, Distributions, Period - June 29, 2023 and thereafter [Member] | Minimum [Member]    
Class of Stock [Line Items]    
Preferred units distribution percentage, per annum   13.75%
Preferred units, distribution rate, per annum   $ 81.1
Preferred stock, dividend amount, per unit, per distribution period   $ 0.872
Subsequent Event [Member]    
Class of Stock [Line Items]    
Preferred unit distribution $ 0.682