CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues:
Total revenues	$ 1,523.5	$ 1,995.3	$ 3,572.4	$ 4,294.7
Costs and expenses:
Product purchases	860.6	1,361.6	2,043.6	3,087.6
Operating expenses	183.4	210.2	383.3	400.5
Depreciation and amortization expense	204.5	237.2	443.6	474.6
General and administrative expense	61.5	72.8	121.9	153.6
Impairment of long-lived assets			2,442.8
Other operating (income) expense	0.4	(0.2)	1.6	3.3
Income (loss) from operations	213.1	113.7	(1,864.4)	175.1
Other income (expense):
Interest expense, net	(96.7)	(72.1)	(194.7)	(152.7)
Equity earnings (loss)	14.9	3.2	35.5	5.9
Gain (loss) from financing activities	21.8		61.1	(1.4)
Change in contingent considerations		0.8		(8.9)
Other, net	0.8		0.8
Income (loss) before income taxes	153.9	45.6	(1,961.7)	18.0
Income tax (expense) benefit	23.2	3.3	318.5	6.2
Net income (loss)	177.1	48.9	(1,643.2)	24.2
Less: Net income (loss) attributable to noncontrolling interests	96.1	59.1	13.6	73.3
Net income (loss) attributable to Targa Resources Corp.	81.0	(10.2)	(1,656.8)	(49.1)
Dividends on Series A Preferred Stock	22.9	22.9	45.8	45.8
Deemed dividends on Series A Preferred Stock	9.2	8.1	18.2	16.0
Net income (loss) attributable to common shareholders	$ 48.9	$ (41.2)	$ (1,720.8)	$ (110.9)
Net income (loss) per common share - basic	$ 0.21	$ (0.18)	$ (7.38)	$ (0.48)
Net income (loss) per common share - diluted	$ 0.21	$ (0.18)	$ (7.38)	$ (0.48)
Weighted average shares outstanding - basic	233.1	232.4	233.1	232.3
Weighted average shares outstanding - diluted	233.8	232.4	233.1	232.3
Sales of Commodities [Member]
Revenues:
Total revenues	$ 1,280.6	$ 1,684.2	$ 3,060.2	$ 3,660.7
Fees from Midstream Services [Member]
Revenues:
Total revenues	$ 242.9	$ 311.1	$ 512.2	$ 634.0