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CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Current assets:    
Trade receivables, allowances $ 0.1 $ 0.1
Targa Resources Corp. stockholders' equity:    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 450,000,000 450,000,000
Common stock, shares issued (in shares) 237,204,119 236,105,293
Common stock, shares outstanding (in shares) 227,062,130 228,221,122
Preferred stock, par value (in dollar per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 98,800,000 98,800,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Treasury stock, shares (in shares) 10,141,989 7,884,171
Series A Preferred Stock    
LIABILITIES, SERIES A PREFERRED STOCK AND OWNERS' EQUITY    
Preferred Series A Liquidation Stock Percentage 9.50% 9.50%
Preferred Stock, Liquidation Preference Per Share $ 1,000 $ 1,000
Preferred Stock, Shares Authorized 1,200,000 1,200,000
Preferred Stock, Shares Issued 0 919,300
Preferred Stock, Shares Outstanding 0 919,300