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Condensed Parent Only Financial Statements, Condensed Balance Sheets (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
ASSETS |  |
Other long-term assets | $ 96.1 | $ 99.1
Total assets | 15,875.7 | 18,815.1
LIABILITIES, SERIES A PREFERRED STOCK AND OWNERS' EQUITY |  |
Accrued current liabilities | 186.4 | 176.8
Other long-term liabilities | 309.1 | 305.6
Contingencies | 0.0 | 0.0
Targa Resources Corp. stockholders' equity | 2,653.9 | 4,920.8
Total liabilities, Series A Preferred Stock and owners' equity | 15,875.7 | 18,815.1
Parent Company [Member] |  |
ASSETS |  |
Investment in consolidated subsidiaries | 3,507.2 | 5,643.4
Deferred income taxes | 59.7 | 53.8
Debt issuance costs | 2.9 | 4.0
Other long-term assets | 9.4 | 9.8
Total assets | 3,579.2 | 5,711.0
LIABILITIES, SERIES A PREFERRED STOCK AND OWNERS' EQUITY |  |
Accrued current liabilities | 30.5 | 31.6
Long-term debt | 555.0 | 435.0
Other long-term liabilities | 38.4 | 44.8
Contingencies | 0.0 | 0.0
Series A Preferred 9.5% Stock, net of discount | 301.4 | 278.8
Targa Resources Corp. stockholders' equity | 2,653.9 | 4,920.8
Total liabilities, Series A Preferred Stock and owners' equity | $ 3,579.2 | $ 5,711.0

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