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Partnership Units and Related Matters - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Limited Partners Capital Account [Line Items]        
Capital contributions to partnership   $ 50.0 $ 200.0 $ 600.0
Number of units, redeemed 5,000,000      
Redemption price per unit $ 25.00 $ 25.00    
Unpaid distributions $ 0.5      
Income attributable to mandatorily redeemable preferred interests   $ 4.9   4.1
Distribution to preferred unitholders   $ 15.1 $ 11.3 $ 11.3
Holders of Limited Partner Interests [Member]        
Limited Partners Capital Account [Line Items]        
Limited partner capital contribution allocation percentage   98.00%    
Targa Resources General Partner LLC [Member]        
Limited Partners Capital Account [Line Items]        
General partner capital contribution allocation percentage   2.00%