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Unit-Based Compensation (Phantom Common Unit Awards) (Details) - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]    
Beginning balance (in dollars per unit) $ 29.21 $ 29.15
Granted (in dollars per unit) 29.77 30.70
Vested (in dollars per unit) 34.32 30.04
Forfeited (in dollars per unit) 28.96 28.16
Ending balance (in dollars per unit) $ 29.10 $ 29.21
Phantom common units [Member]    
Nonvested, Number of Shares [Roll Forward]    
Beginning balance (in units) 2,113,322 2,124,012
Granted (in units) 17,235 655,630
Vested (in units) 49,361 477,256
Forfeited (in units) 5,816 189,064
Ending balance (in units) 2,075,380 2,113,322