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Earnings per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Reconciliation of Net Income and Weighted Average Shares Outstanding Used in Computing Basic and Diluted Net Income Per Common Share | The following table sets forth a reconciliation of net income and weighted average shares outstanding used in computing basic and diluted net income per common share (in millions, except per share amounts):
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Net income (loss) attributable to Targa Resources Corp. |  | $ | (1,553.9 | ) |  | $ | (209.2 | ) |  | $ | 1.6 |
Less: Dividends on Series A Preferred Stock (1) |  |  | 91.7 |  |  |  | 91.7 |  |  |  | 91.7 |
Less: Deemed dividends on Series A Preferred Stock (2) |  |  | 39.2 |  |  |  | 33.1 |  |  |  | 29.2 |
Net income (loss) attributable to common shareholders for basic earnings per share |  | $ | (1,684.8 | ) |  | $ | (334.0 | ) |  | $ | (119.3 | )
Weighted average shares outstanding - basic |  |  | 232.2 |  |  |  | 232.5 |  |  |  | 224.2 |
Dilutive effect of unvested stock awards (3) |  |  | — |  |  |  | — |  |  |  | — |
Weighted average shares outstanding - diluted |  |  | 232.2 |  |  |  | 232.5 |  |  |  | 224.2 |
Net income (loss) available per common share - basic and diluted |  | $ | (7.26 | ) |  | $ | (1.44 | ) |  | $ | (0.53 | )
(1) | Includes $1.1 million attributable to the dividends paid upon the partial repurchase of Series A Preferred Stock in December 2020. |
(2) | Includes $1.6 million attributable to the partial repurchase of Series A Preferred Stock in December 2020. Refer to Note 11 – Preferred Stock. |
(3) | For all periods presented above, all unvested restricted stock awards, unvested performance stock units, and Series A Preferred Stock were antidilutive because a net loss existed for those respective periods. |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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