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Partners' Equity, Income Allocations and Cash Distributions - Cash Distributions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Aug. 13, 2020
Aug. 03, 2020
Jul. 23, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Incentive Distribution Made to Managing Member or General Partner [Line Items]              
Document Period End Date           Jun. 30, 2020  
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       $ 34.5 $ 68.5 $ 68.9 $ 136.7
Subsequent Event              
Incentive Distribution Made to Managing Member or General Partner [Line Items]              
Dividends Payable, Date Declared     Jul. 23, 2020        
Dividends Payable, Date to be Paid Aug. 13, 2020            
Dividends Payable, Date of Record   Aug. 03, 2020