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CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Current assets: |  |
Trade receivables, allowances | $ 3.9 | $ 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) | 235,671,273 | 234,792,888
Common stock, shares outstanding (in shares) | 228,655,274 | 228,061,853
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) | 7,015,999 | 6,731,035
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 | 919,300 | 919,300
Preferred Stock, Shares Outstanding | 919,300 | 919,300

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