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Capital Accounts, Distributions (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Feb. 28, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Distributions to Partners [Abstract]        
Number of days after quarter end to distribute available cash   45 days    
Cash payments made in connection with distribution equivalent rights   $ 27.1 $ 22.1 $ 17.7
Subsequent Event [Member]        
Distributions to Partners [Abstract]        
Cash distributions paid $ 988.8      
Cash payments made in connection with distribution equivalent rights $ 7.1      
Cash Distribution [Member] | First Quarter 2018 Distribution [Member]        
Distributions to Partners [Abstract]        
Distribution Per Common Unit (in dollars per unit)       $ 0.4275
Record Date       Apr. 30, 2018
Payment Date       May 08, 2018
Cash Distribution [Member] | Second Quarter 2018 Distribution [Member]        
Distributions to Partners [Abstract]        
Distribution Per Common Unit (in dollars per unit)       $ 0.4300
Record Date       Jul. 31, 2018
Payment Date       Aug. 08, 2018
Cash Distribution [Member] | Third Quarter 2018 Distribution [Member]        
Distributions to Partners [Abstract]        
Distribution Per Common Unit (in dollars per unit)       $ 0.4325
Record Date       Oct. 31, 2018
Payment Date       Nov. 08, 2018
Cash Distribution [Member] | Fourth Quarter 2018 Distribution [Member]        
Distributions to Partners [Abstract]        
Distribution Per Common Unit (in dollars per unit)       $ 0.4350
Record Date       Jan. 31, 2019
Payment Date       Feb. 08, 2019
Cash Distribution [Member] | First Quarter 2019 Distribution [Member]        
Distributions to Partners [Abstract]        
Distribution Per Common Unit (in dollars per unit)     $ 0.4375  
Record Date     Apr. 30, 2019  
Payment Date     May 13, 2019  
Cash Distribution [Member] | Second Quarter 2019 Distribution [Member]        
Distributions to Partners [Abstract]        
Distribution Per Common Unit (in dollars per unit)     $ 0.4400  
Record Date     Jul. 31, 2019  
Payment Date     Aug. 13, 2019  
Cash Distribution [Member] | Third Quarter 2019 Distribution [Member]        
Distributions to Partners [Abstract]        
Distribution Per Common Unit (in dollars per unit)     $ 0.4425  
Record Date     Oct. 31, 2019  
Payment Date     Nov. 12, 2019  
Cash Distribution [Member] | Fourth Quarter 2019 Distribution [Member]        
Distributions to Partners [Abstract]        
Distribution Per Common Unit (in dollars per unit)     $ 0.4450  
Record Date     Jan. 31, 2020  
Payment Date     Feb. 12, 2020  
Cash Distribution [Member] | First Quarter 2020 Distribution [Member]        
Distributions to Partners [Abstract]        
Distribution Per Common Unit (in dollars per unit)   $ 0.4450    
Record Date   Apr. 30, 2020    
Payment Date   May 12, 2020    
Cash Distribution [Member] | Second Quarter 2020 Distribution [Member]        
Distributions to Partners [Abstract]        
Distribution Per Common Unit (in dollars per unit)   $ 0.4450    
Record Date   Jul. 31, 2020    
Payment Date   Aug. 12, 2020    
Cash Distribution [Member] | Third Quarter 2020 Distribution [Member]        
Distributions to Partners [Abstract]        
Distribution Per Common Unit (in dollars per unit)   $ 0.4450    
Record Date   Oct. 30, 2020    
Payment Date   Nov. 12, 2020    
Cash Distribution [Member] | Fourth Quarter 2020 Distribution [Member]        
Distributions to Partners [Abstract]        
Distribution Per Common Unit (in dollars per unit)   $ 0.4500    
Record Date   Jan. 29, 2021    
Payment Date   Feb. 11, 2021