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Equity - Quarterly Distributions on Common Units (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended 9 Months Ended
Nov. 17, 2020
Aug. 18, 2020
May 19, 2020
Feb. 25, 2020
Nov. 19, 2019
Aug. 19, 2019
May 20, 2019
Nov. 17, 2020
Feb. 25, 2020
Distribution Made to Limited Partner [Line Items]                  
Distribution per common unit (in dollars per share)   $ 0.25 $ 0.25 $ 0.25 $ 0.31 $ 0.43 $ 0.19   $ 1.18
Distribution per common unit   $ 88.3 $ 87.2 $ 87.4 $ 36.5 $ 49.9 $ 21.0   $ 194.8
Forecast                  
Distribution Made to Limited Partner [Line Items]                  
Distribution per common unit (in dollars per share) $ 0.25             $ 0.75  
Distribution per common unit $ 88.4             $ 263.9