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Partners' Equity, Income Allocations and Cash Distributions - Cash Distributions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Nov. 12, 2020
Nov. 02, 2020
Oct. 22, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Incentive Distribution Made to Managing Member or General Partner [Line Items]              
Partners' Capital Account, Units       59,630,030   59,630,030  
Ownership percentage, controlling interest       57.00%   57.00%  
Common Unit Issuance Program           $ 200.0  
Partners' capital account, units, sale of units (in shares)           2,413,153  
Limited partner distribution           $ 2.5  
Gross proceeds from issuance of common units           82.3  
Distributions declared       $ 37.0 $ 68.5 $ 105.9 $ 205.2
Subsequent Event              
Incentive Distribution Made to Managing Member or General Partner [Line Items]              
Dividends Payable, Date Declared     Oct. 22, 2020        
Dividends Payable, Date to be Paid Nov. 12, 2020            
Dividends Payable, Date of Record   Nov. 02, 2020