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Partnership Units and Related Matters - Summary of Distributions Declared or Paid by the Partnership (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Distributions Declared [Member]    
Distributions declared or paid by the Partnership [Abstract]    
Distributions payable date May 11, 2017  
Total Distributions $ 209.6  
Distributions to Targa Resources Corp. $ 206.8  
Distributions Paid [Member]    
Distributions declared or paid by the Partnership [Abstract]    
Distributions payable date   Feb. 10, 2017
Total Distributions   $ 198.1
Distributions to Targa Resources Corp.   $ 195.3