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CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
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) 300,000,000 300,000,000
Common stock, shares issued (in shares) 219,426,286 218,152,620
Common stock, shares outstanding (in shares) 218,832,135 217,566,980
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) 594,151 585,640
Series A Preferred Stock [Member]    
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 965,100 965,100
Preferred Stock, Shares Outstanding 965,100 965,100