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Capital Accounts, Redeemable Preferred Limited Partner Interests (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Mar. 31, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Temporary Equity [Line Items]        
Preferred units outstanding, beginning balance (in units) 50,138   50,138  
Series A cumulative convertible preferred units, paid-in kind distribution (in units) 274      
Preferred units outstanding, ending balance (in units) 50,412   50,412  
Total distributions paid to convertible preferred unitholders     $ 2.8  
Cash distributions paid to convertible preferred unitholders     2.5  
Net cash proceeds from the issuance of preferred units     $ 0.0 $ 32.5
Common units exchanged for preferred units, with common units received being immediately cancelled   $ 17.5   $ 17.5