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CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Current assets:    
Trade receivables, allowances $ 2.5 $ 2.5
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) 241,697,875 240,095,699
Common stock, shares outstanding (in shares) 218,328,522 222,611,259
Treasury stock, shares (in shares) 23,369,353 17,484,440