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Earnings per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Common Share [Line Items]        
Net income (loss) attributable to Targa Resources Corp. $ 56.2 $ 81.0 $ 202.6 $ (1,656.8)
Less: Deemed dividends on Series A Preferred Stock   9.2   18.2
Net income (loss) attributable to common shareholders $ 34.4 $ 48.9 $ 158.9 $ (1,720.8)
Weighted average shares outstanding - basic (in shares) 228.6 233.1 228.5 233.1
Dilutive effect of unvested stock awards 2.7 0.7 2.4  
Weighted average shares outstanding - diluted (in shares) 231.3 233.8 230.9 233.1
Net income (loss) available per common share - basic (in dollars per share) $ 0.15 $ 0.21 $ 0.70 $ (7.38)
Net income (loss) available per common share - diluted (in dollars per share) $ 0.15 $ 0.21 $ 0.69 $ (7.38)
Series A Preferred Stock [Member]        
Earnings Per Common Share [Line Items]        
Less: Dividends on Series A Preferred Stock $ 21.8 $ 22.9 $ 43.7 $ 45.8
Less: Deemed dividends on Series A Preferred Stock   $ 9.2   $ 18.2