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Capital Accounts, Distributions (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Feb. 11, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
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   $ 30.9 $ 27.1 $ 22.1
Subsequent Event [Member]        
Distributions to Partners [Abstract]        
Cash distributions paid $ 1,020.0      
Cash payments made in connection with distribution equivalent rights $ 8.0      
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  
Cash Distribution [Member] | First Quarter 2021 Distribution [Member]        
Distributions to Partners [Abstract]        
Distribution Per Common Unit (in dollars per unit)   $ 0.4500    
Record Date   Apr. 30, 2021    
Payment Date   May 12, 2021    
Cash Distribution [Member] | Second Quarter 2021 Distribution [Member]        
Distributions to Partners [Abstract]        
Distribution Per Common Unit (in dollars per unit)   $ 0.4500    
Record Date   Jul. 30, 2021    
Payment Date   Aug. 12, 2021    
Cash Distribution [Member] | Third Quarter 2021 Distribution [Member]        
Distributions to Partners [Abstract]        
Distribution Per Common Unit (in dollars per unit)   $ 0.4500    
Record Date   Oct. 29, 2021    
Payment Date   Nov. 12, 2021    
Cash Distribution [Member] | Fourth Quarter 2021 Distribution [Member]        
Distributions to Partners [Abstract]        
Distribution Per Common Unit (in dollars per unit)   $ 0.4650    
Record Date   Jan. 31, 2022    
Payment Date   Feb. 11, 2022