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Earnings per Common Share (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share [Abstract]        
Net income (loss) attributable to Targa Resources Corp. $ 69.3 $ (47.3) $ (1,587.5) $ (96.4)
Less: Dividends on preferred stock 32.4 31.3 96.5 93.2
Net income (loss) attributable to common shareholders $ 36.9 $ (78.6) $ (1,684.0) $ (189.6)
Weighted average shares outstanding - basic (in shares) 233,400,000 232,700,000 233,200,000 232,400,000
Dilutive effect of unvested stock awards [1] 0.4      
Weighted average shares outstanding - diluted (in shares) 233,800,000 232,700,000 233,200,000 232,400,000
Net income (loss) available per common share - basic and diluted(in dollars per share) $ 0.16 $ (0.34) $ (7.22) $ (0.82)
[1] For the three months ended September 30, 2020, on a weighted average basis, 2.3 million unvested restricted stock awards, 0.5 million unvested performance stock units and 46.5 million Series A Preferred Stock were antidilutive, and accordingly, were excluded from the diluted earnings per common share calculation. For all other periods presented above, all unvested restricted stock awards, unvested performance stock units, and Series A Preferred Stock were antidilutive because a net loss existed for those respective periods.